Sometimes though, for making such a bet, the loser has to do something small for the winner... just for making a stupid bet.
'Damn she's hot. Too hot for you.'
'Whatever, I bet you I can get in her pants by the end of the month'
a month later
'where's my $20?'
'Dude, it was an idle bet, you know that!'
'Yeah, you're right. Kiss my ring.'
'Kiss my ring. Or the $20, either one'