♪ hey, teach ♪ >> the idea was about creating a performance and putting it up in front of people who were expecting the performance where they were. it's very funny to have somebody stand up in the middle of a very normal situation and start singing. ♪ people tend to dance ♪ >> i love, love, love that idea. i always felt that it would be fun to do. but that i could never keep a straight face. ♪ ♪ reach, teach ♪ >> it's very original and it's a little subversive. you've got that element of like, oh, i've never seen that before. so i love that. i like musicals. >> as simple as it may look, breaking out into song in class took a fair amount of planning. mike and his band of pranksters picked the largest lecture hall they could find which turned out to be a chemistry class.