Bad Hair Day is a side mission in Borderlands 2
Liar's Berg (Mission Start)
Pick up Bullymong Hair 0/4
Return to Sir Hammerlock
Return to Claptrap
Style is everything. Do you see my hat? It is the hat of a gentleman. and yet, it's missing something - some je ne sais quois, I think some Bullymong Fur might do the trick. If you could bring me some. To harvest Bullymong Fur, you'll need to rip it from their hides with your bare hands - just weaken a Bullymong with gunfire, then finish him off with fisticuffs!
Collect Bulllymong Fur
Uncommon Shotgun (Green) (Claptrap)
Uncommon Sniper Rifle (Green)(Sir Hammerlock)
"The Bullymong is injured - now deliver the coup de grace with your melee weapon!"
"A Stunning riposte! Now collect the fur - in addition to making for spectacular hat decoration, I shall study the fur for my almanac about the creatures of Pandora"
"I apologize I wasn't clear enough - you see, you'll need to kill the Bullymong with a melee attack in order to harvest its fur. Sure, you could try to steal the fur from a Bullymong's dead body, but where's the fun in that? Blatantly unreasonable requests, ho!"
"That Sample will do admirably! Find me a few more, if you please."
Claptrap and Hammerlock fight over the hair
Claptrap: Ooh, are you collecting Bullymong fur? I LOVE that stuff! It's soft, warm, and really good at absorbing robot tears! Once you're done collecting all the fur, why doncha bring it to me instead of Hammerlock
Hammerlock: I overheard Claptrap asking you for the Bullymong fur you are collecting. As I fear he would do something irredeemably stupid with it, like make a mohawk out of it or something, let me sweeten the deal: If you bring me the fur, I shall give you one of my finest sniper rifles.
Claptrap: So Hammerlock wants to give you a sniper rifle? I laugh at his offer! HA! If you bring ME the fur, I'll give you a badass shotgun I found in the hands of a dead Vault Hunter!"
Hammerlock: Wonderful! You've gotten all the fur I need. Bring it to me and my sniper rifle shall be yours
Claptrap: Screw that noise - bring ME the fur, and I'll give you a shotgun!
Sir Hammerlock asked you to find some Bullymong hair so he may decorate his hat with it. In order to collect hair from the Bullymongs, you will have to weaken them with gunfire, then finish them off with a melee attack.
The fur has been delivered and you received a new weapon! A good day for everyone! Except the bullymongs, but screw those guys.
Strategy Guide - Tips - Cheats
You need to weaken the Bullymongs with guns, but then kill them using melee.
Give Hair to Claptrap or Hammerlock?
The Sniper Rifle offered by Sir Hammerlock is a better reward, but giving the hair to Claptrap yields a funnier result (see: Mohawk Claptrap)