There is a game show called Deal or No Deal, where people are presented with a number of boxes containing unknown amounts of token money, and the contestant has to try and eliminate boxes which have the lowest amounts possible. Ideally, at the end they're left with a box with the most token money, which they would then redeem for real money. Alternatively, the banker may make a deal offering a known amount of money, which the participant can choose to accept, rather than continue with the competition.
Now although they're not gambling with their own money, they are effectively trying to get the most prize money.
Is participating in such a game show haram?
I would say yes, but according to the above link this show is also broadcast in a number of Islamic countries, such as Afghanistan, UAE and Iran.