Yea i have failed in the fair a lot want a undo button there.I recenlty bought the wrong item in the fair cause when i was about to click on the item the timer just changed and I ended up buying a lvl 4 chip for 140 or so gems which i definitely did not want, also one of my guild mates bought some thing for 400 gems by miss clicking here and there. So i hope the devs can add this it should be too hard for them either imo