My brother and I used to play a game we dubbed Burt Stanton's Poker with a few of the other guys we worked with while we were dealing bar gigs and waiting for things to start.
Everyone antes an amount and gets dealt ten cards. Two cards get put face down in the middle of the table (it's a five-player-max game)
The dealer picks which card in the middle to turn over, then picks four cards from their hand to combine with that face up card to make their first hand. Standard five-card hand rankings
apply. Action proceeds clockwise and the other players do the same.
Once everyone's shown a hand, the second middle card gets turned up and the process gets repeated - starting with the dealer, everyone uses another four cards from their hand to make a second pair.
If one player wins both hands, they take the whole pot. If there's a different winner on the first and second hands, the pot is split in half. Half of it goes to a jackpot for the next hand, and the other half is split between the two winning players. Jackpot keeps accumulating until someone wins both hands.
The antes go up and down in relation to the size of the jackpot though to be honest, I can't remember the formula. I think they need to go up when the jackpot reaches the size of the preflop pot or something.
Is it silly? Hell yeah. But the important thing was it was convoluted enough (and short-handed enough) that most of the patrons couldn't be bothered joining in