Game Show Geekery:
Showcase Showdown $6
Draw Showcases of four cards for each player, face down. Reveal the first two of each Showcase. Each player makes a bid as to the total cost of the cards. The player closest to the total cost without going over gains all four cards. If any player is uniquely $1 or less away from the total cost, they win all Showcases. If two or more players are $1 or less away from the total cost, they each win their Showcase.
Have your pet(s) spayed or neutered. If they already are, +$2.
Setup: Place a copy of each kingdom card not in use into the Showcase deck.
Press Your Luck $5
Hoping for Big Bucks and No Whammies, draw the top card of the Press Your Luck deck. If it is not a Whammy, place it into your hand. If you hit a Whammy, trash any treasure in your hand, and place the Whammy on top your deck. Four Whammies and you're out of the game.
Setup: Place 10 extra copies of each Treasure card except Copper into the Press Your Luck deck, along with the Flokati Rug card, Trip to Knott's Berry Farm card, and the Double Your Treasure + 1 Action card. Shuffle in 1 Whammy for every three cards.
Russian Roulette $4
Reveal the top card of your deck. If you reveal a victory card, discard your hand. If any other card is revealed, trash the Russian Roulette. Each other player gains a Russian Roulette.