our robot's gyro freaked on us, and pushed a 250+ pound table that was not meant to move. It took two adults to just push it back!
... and the other day at the 4-H fair, we built a robot that you can ride on. the only kill switch that worked was on the actual bot itself (in the form of a breaker, the switch on the remote would only make it lose the signal.) We were unpacking our trailor, and i was using the bot to haul around crates (approximately a 100 lb. load ) when the gyro also freaked on us. It ended up taking out 2 and a half boothes. Luckily no one was there due to the fact that it was before the fair started.
I know you are thinking about why the kill switch on the remote did not work. it was because we were using a vex Robot Controller so it was never meant to operate on such a big scale.