1. Choo Choo Train
“Every time you laugh, you must pump your arms back and forth. This inevitably gets other people to laugh how ridiculous it looks and soon everyone is moving their arms which causes more laughing and soon everyone is dead.” - Bananajon1
7. Water Buffalo
“Here’s only one rule: hold your drink with your non-dominant hand. If anyone participating in the game catches you at any time holding your drink with your dominant hand, then you chug your drink on the spot. It doesn’t matter if you have beer, wine, or everclear; you finish that drink on the spot.” - liddok3vin
11. Get Down Mr. President
“When the rule maker puts his/her finger up to their ear (like listening to a secret service earpiece) everyone must follow suit. Then, everyone jumps up and yells “get down Mr. President!” at the last person to do so, and tackles them to the ground.” - Dragonpunch84
I would suggest buying some kneepads before trying this one out.
Read more at the thread “Drinkers, what is the best rule you’ve made in King’s Cup?“