Our group was a troupe of joke tellers asking for the crowd to suggest a topic. No matter what the topic they were given, they all told the same joke: "99--- walked into a bar..." So, if someone called out "dentists" all of them told variations of "99 dentists walked into a bar" finishing with their own tag such as "The barman said 'I can't serve you, you know the drill." (well, their jokes were better than that.)
They were all marvelous and soooo quick. Former Streetmosphere performers include future MAD TV stars Mo Collins and Paul Vogt.