When you have gloves on and you have to answer your iPhone. You are in a conundrum. Do you remove you glove? NO! Use your bottom lip (never your upper lip,tongue or teeth) to "slide to unlock". You leave an iLipSmear on the bottom of your phone.
Yo foo, the gold in yo mouth scratched my screen. Don't use you teeth! Awe-man, now i gots a big o iLipSmear...