Nokia 8290. Had 2 friends try to destroy them and failed.

1. Dropped it into the snow, and didn't realise it. 2 days later finds it on top of the drying cement after the snow melted. Still powered on and worked fine.

2. Dropped into the street, face up. Runs over it with his car (1980 something Chevy Caprice, aka a boat). Finds it 2 days later, still works. Suffered a broken faceplate and LCD. Total repairs would have been about $20-$30 dollars.