Oh man, my Nokia 8910 (the one with the titanium casing) was damn near indestructible. I'd dropped it more times than I can count (once off a 2nd story in a nightclub into a dance floor where it was promptly trampled), backed over it accidentally because it fell out of my pocket as I got into the car and left it in my pocket and washed it 3 times (it stayed on the whole time). The 4th washing was the one that finally killed it.
We played football in the classroom with my Sony Ericsson K700i when I was in high school. I still have holes in my wall because I kept throwing it every time some game annoyed me.
My charger died, so I disassembled it and put the wires directly on the battery. Finally, I accidentally crossed the wires and the phone died after burning for like 2-3 minutes.