Used to run a toy department first time around. Grew a collection of 7-8 "damaged" Furbys in the warehouse because people expected them to know lots of English off the bat. So through the week, I'd set up their IR properly so they'd chatter to each other and learn........|
.....and on a Thursday I'd turn them upside down, jam paper in their mouths, and hide them. Friday was my day off, and I'd return on a Saturday to hear tales of an entire day of farting, burping, crying and wailing in despair after hours of overfeeding, with nobody able to find them.
Some folk found it hilarious, others were quite unsettled by the cries of "ME NO WELL ! BUUUUURP".