I'll match your 3 crankarm failures:
1. 1974: Campagnolo NR, left crankarm, snapped below logo
2. 1988: Shimano Deore DX, left crankarm, crack propagating from spindle hole
3. 1991: Shimano Exage, left crankarm, crack propagating from spindle hole
and raise you one Ultegra cartridge bottom bracket, snapped at left taper, about one week after the 1R let go!