I have a ton and a half of in-game tribbles. It's insane.
Anyways, back in the day before DVD I bought a tribbles VHS episode set with "The Trouble with Tribbles" on one cassette and "Trials and Tribble-ations" on the other. It came with a tribble that freaked out (like as with klingons) when you pressed it, and I have since had to replace the batteries and all. I highly recommend having a tribble.