Have two students dressed similar, come upfront very formal and stiff. (Dressing up is funny but not necessary.) Have lights turned off as it needs to be fairly dark for this to work. Your students then produce two pen-lights each and stick each pen-light in a nostril. They then hum some simple song and flash the nose lights in unison with the song. The light makes their nose glow. Hilarious.
Added by Geeky