Has anyone noticed the hidden claptrap that's on top of the store in Fyrestone? I have :)
There is no benefit for finding him though. There are rumors that you get experience points for reaching him, but I haven't noticed anything.

Here are the steps on how to get to him:

1. Go outside the fence(kill the bandits ofc)
   
2. Go into the crevice in the rocks
   
3. Now grenade jump your way up(this might take you while)
   
4. Keep jumping until you reach the claptrap