Videos of teachers that students taped in secrecy are all over online sites like YouTube and MySpace. Angry teachers, enthusiastic teachers, teachers clowning around, singing, and even dancing are captured, usually with camera phones, for the whole world to see. Some students go so far as to create elaborately edited videos, shot over several days, that use popular soundtracks and sound effects to poke fun at their teachers. The threat of exposure by cell phone cameras has potential professional, as well as emotional, consequences for teachers. This article reports on the growing concern among teacher advocates about the proliferation of taped videos that is causing stress for teachers and some students, and could have a chilling effect on classroom discussions. [This article was produced by Editorial Projects in Education, Bethesda, MD.]