♪ hey teach, i've got a question ♪ >> i don't think i can describe to you accurately just how scared i was. i was afraid somebody was going to stop me. i was interrupting a class and i thought the teacher would run up and shut me up or somebody would get in my way or something would happen that would stop the prank right in the middle and that would be the end of it. so, i was scared to death. >> what about the teach? what did he think? >> i had no idea this was going to happen. i was stunned. it was so well done so well produced. choreographed, the singing. everything, it was so professional. it was as if you know gilbert and sullivan met vh 1 and appeared in my class. >> while the members of the group have since graduated and moved on their work lives forever on the web. and there's a little argue that in this columbia university lecture hall they captured a little piece of viral video magic.