I was told at the first Transworld I attended...?? Mine did. I made them. I saw a great many people expressing fear as those items went to "work" within my haunted house.
My Micro-Waved Hampster would pop open the micro-wave door, enter the kitchen, all the lights on...the customers would be looking, anticipating because he would just keep coming out of that small box!
Then he would lift & turn towards them swiftly!
This worked to scare.
My long, black, slimey tenticle (with "suckers")coming from a hole in the wall of the wine cellar scared many also, since that was the LAST place most would ever expect to see such a thing.
Neat thing was if someone looked into his hole, you would see just a hole about 3 feet long then solid dirt.
He would drop down, from above, turn horizontal come out through the hole in the rocks,then be in the wine cellar, then turn upwards and to the right, and sometimes "Slap" the metal manacle hanging from the stone wall! If a customer of two hadn't seen him by then the metal against rock noise would make them turn and look-screams would follow.(I have this on video from Peoria-PBS)
My Crawl-space display scares almost no one but everyone thinks it's neat, I make jokes about it and have a few stories to relate concerning it too.
Unfortunately the Tenticle has been broke for now many years and when I tried to remove it from it's location to fix it I got broke for awhile, pulling muscles, ex cetra.
The Hampster just needs minor re-adjusting which I have not gotten around to doing, my Wife Jessica fixed it last time.