My younger cousins asked me to play. I insisted we play by the actual rules and destroyed them. Rather than being put off, they rushed to use my strategy against all their friends.

Alternately, I saw a group of friends starting a game in a common area. I told them to not use house rules (like the free parking bullshit) and they said it made the game more fun. I said you're gonna be crying in 2 hours. I came back 2 hours later and it turns out I'm a prophet.