My friend was pressured into entering some money into a super bowl pot, but he has something against gambling winnings, so to avoid winning anything, he entered $1 under my name into a random score prediction, which won. So without entering any money, or even being present, or even watching the super bowl, I won $20.
So far, I've had good returns gambling with other people's money. The only other time I've done it was in Las Vegas. I was too young to gamble, but my friend wanted me to try anyway, so he gave me a quarter to put into a slot machine while standing in line to register for the hotel. And I got 3 quarters back, thus tripling my investment.