Slow-motion grenade

Stand under the bridge (don't lower it) in Zanzibar (Level). Look up and throw a Grenade through the hole past the metal piece and watch. Frags seem to work best. The grenade will travel through the air very, very SLOWLY, but will return to normal speed when it hits something or falls off of the bridge.This method is great, and one of my favorite ways to create a diversion in CTF.