£600 in fortune wheel, never got a run, knew the engineer, he checked the payout percentage and told me it was down to 2%, there was a fault with the machine, the owner said give me £6 in tokens as a sorry gesture, I won't repeat what I said
About 20 years ago, I walked into an arcade and put 2p in a rat-race got a 4p win and pressed exchange pressed the first reel and the cash amount landed on 12p, the rat came in, I collected the 12p and walked out 10p up, just thought I'd add this to the post, IT CAN BE DONE!