On a related note, I used to work in a car stereo store, as an installer. A buddy of mine had a 1000w RMS amp that he used to drive his subs. And yes it really was 1000w, not one of those cheapos that claim to be 1000w. (it was a fosgate power 1000 back when their amps actually produced more power than they said they did)
Anyways, we used to like hooking up factory speakers that were headed to the trash to it. Never got old.
Better than that, we had a cheap 100w sub, and we spliced an extension cord to it, and plugged it into the wall. Instant 60Hz 3000w power. It almost jumped off the bench (it wasnt in a box) and then the voice coil melted. It was completely seized up. That was fun.