[ken5050]

Remember those wire coils that you plugged in, and dropped into the cup? They looked liked IUDs on steroids..

[arthurus]

I used one of those in college. If I wasn’t paying attention the water would boil furiously in a very short time and splash out of the cup.

[JRandomFreeper]

Do you mean one of these:

I've got a couple of them still. ;)

/johnny