I did it once. I bid $20.07 on a beater T206 Ganley with a Sweet Cap 150/30 back. Accidentally bid $2007. I won it for $180 and change, for reasons I don't understand (maybe that particular SC series/factory combo is tougher for him?). So that one cost me a lot more than I thought my mistake would. Oh well, my mistake, I paid what seemed like 500% of the value and learned a lesson. Now I make double sure not to hit the confirmation button on auto pilot