If any of these have already been mentioned and I missed it, whewpsies, sorry! But, here are some pretty ridiculous but fun games [I have no idea at what point adults stop enjoying these, but my friends and I thoroughly still play all of them]. Hope this helps, have fun!
Blacklight Beer Pong/Flip Cup
Putting this together can sometimes take a bit of work depending on your house, but make the area completely black. Previously I've made the area just large enough for a legal size beer pong table and enough room for two teams and about five onlookers [it took two 3 feet long black lights to light this], but you can make it as large or small as you wish as long as you have the lights for it. Some years I bought those neon cups and neon balls, and then broke open glow sticks to draw designs on a plastic tablecloth, and some years I've used clear cups and tonic water (which makes the game incredibly hard, actually), and you can also draw designs on the cups with glow stick juice [that's good for flip cup]. Have some fun with it! You can even pour tonic water into clear bottles and label them differently for decor in the room. It's a lot of fun.
Glow in the Dark Ring Toss [with pumpkins!]
I grow my own pumpkins for this, so they're all different sizes which can make it really hard, but you can choose whatever kind of pumpkins you want, just ensure they have a solid stem. I have this as an outside game or a basement game. Use glow sticks to color the stems of the pumpkins, or you carve out the pumpkins and toss some tea lights inside and that's your lighting. Buy the necklace glow sticks and those are your rings. You can play around with this one and make it as hard or as easy as you want!
Pick Your Poison
This game is really disgusting. It's a card game that you buy and it's a "Would you Rather" kind of game, except the choices are usually really, really horrifying or gross. You can have it set aside for people to play, or you can incorporate it into your entire party. This year I'm thinking of setting up a station right at the door and they pick up one of these cards, and tape it up to a big board and write down their answer. It's really fun to see what people choose and ends up being a good conversation piece. Great icebreaker if you've got people who are new to your guestlist.
Grab Bag
My friends and I have this terrible tradition where we buy a bunch of the worst cheap "on sale" nips we can find. We collect them all in a cauldron or a hat or a bag and everyone has to pick one. At some random, unknown point in the night we stop the music, someone yells "GRAB BAG" and you have 5 seconds to trade with someone if you want, at the end of that 5 seconds you have to drink whatever you have, regardless of how gross it is.
Spooky Charades / Telephone Charades
Prior to the party, make a nice long list of super ridiculous, spooky, horrifying, and fun charade scenes. Put them all in hat, pumpkin, cauldron, whatever, [you can separate by topic if you want]. You have the charades area be glow in the dark, candlelit, by a bonfire, outside with flashlights. You can find options online, but my friends and I like to pick the scenes ourselves. You can play in teams, pairs, one at a time, whatever. You can also turn it into telephone charades, which is really fun if you're drunk: one person acts out, one person is guessing, everyone else is facing away; when the person guessing has an idea, they tap one of the people turning away and whispers what they think it is; the first guesser and actor get in line and face away, while the person who was tapped and the person next to them step up to the stage; the person who was tapped acts out what they thought they heard the first guesser say, while the other watches; so on and so forth until the last person acts it out.
Park Bench/Improv Games
Similar to charades, but you can speak and interact with other people. My friends and I will create lists of things that people can pick beforehand. There's two ways we play: traditional park bench, or improv prop games [the caveat is that your team members ARE the props]. We create lists of scenarios beforehand, usually different lists [one for park bench, one for improv games], and we try to be as wild as possible. For park bench we've had some of the following: retired reaper, ghost with aracnaphobia, pirate who goes into labor, witch with a fear of flying, vegan mad scientist, vampire with hemaphobia. For improv games, here are some scenarios: bloopers from Nightmare on Elm Street, skeletons go bowling [this is fun because people have to be the balls and the pins and it's hysterical], pirates lost in the center of London, werewolf documentary.
