[UnderMan]

One idea is to modify the Trash Can Trauma to a jack in the box. Here's a cool looking one where it's arms raise up too:
http://villagehaunt.synthasite.com/tct-sub-page.php
Otherwise, look at the other TCT design websites for different ideas. Most use pneumatics. I'm sure there are some designs that can use motors instead.

 

[UnderMan]

One idea is to modify the Trash Can Trauma to a jack in the box. Here's a cool looking one where it's arms raise up too:
http://villagehaunt.synthasite.com/tct-sub-page.php
Otherwise, look at the other TCT design websites for different ideas. Most use pneumatics. I'm sure there are some designs that can use motors instead.