What is the drink thing called and what does it do? I got it the other day and noticed it made me go in to third person mode and jump wonky.

as to what it does you go temperarily invulnerable. bullets pass through you but you cannot attack. However after it wears off you have a sugar crash as such and have a moment of slowness.

I like scouts. They're fun to play.

http://tf2wiki.net/wiki/Bonk!_Atomic_Punch

The pistol is much better to have equipped if you want to kill. To just annoy the enemy without killing them, bonk can be a solution.

Bonk is a good if you want to run away, or distract a sentry for a team mate if your lacking an uber.
otherwise its useless imo

Drink bonk.
Walk up to Soldier.
Soldier kills himself with splash damage.
Win