The very last bounty challenge I need to complete before unlocking GLaDOS' bounty item is this: "Win a Showdown With Only a High Card." What the heck?! So basically I have to get EXTREMELY lucky and hope that no player I'm versing has anything between their hand and the river, I have to have nothing between my hand and the river, I have to force at least one person (who's obviously bluffing) into a showdown, AND I have to win? Am I missing something or is this ludicrous and really unlikely to happen? I'm not much of a poker player so please forgive my terminology if it's wrong.
Any suggestions on how to beat this challenge?