Ah, a fellow "prestidigitationist"
, yes definitely helps with creativity and new ideas in Halloween & prop design !
Ya, I'm sure the mug is break away variant, & the bottles, most likely being sold to those needing break away glass items for say a local / home movie,......or a stage performance.
Would get expensive, but if a haunt was doing a live acting scene, say once every 1/2 hr, needing break away bottles,mug,etc. more for a pro payed haunt.
or an occasional joke on a friend, ( who hopefully remembers which bottle is the break away when they smack them on he head with it,.....Hee-Hee )