Hmmmm.... This was in a 3rd edition Lord of the Rings campaign adapted from MERP old books. The chars were investigating a murder in Moria, and I had the intention of putting them in a situation where they would be forced to run from the awakening of the Balrog. Typically, the team's resident idiot started making stupid jokes about dwarves like "Where is Snowhite?" "Can I sing Ayy-hoo with you?".

The rest of the group, who usually is good in letting the guy be entertaining without getting too out of hand, decided to play along. Soon, I was getting very angry that instead of concentrating, they were out to ruin the campaign. I guess they did not find it funny any longer after they were arrested by the local guards and executed for treason, while the bad guys got away with everything...