Step 1: Go Engineer.

Step 2: Make a teleporter entrance and exit.

Step 3: Go through it till bread comes out of the teleporter with you. (You can also do it as any other class but there's gotta be an Engineer on your team with a working teleporter)

DONE! Have fun with the bread!
[Update: Bread comes out of the teleporter EVERYTIME you come out of the exit so it shouldn't be hard to get now.]

By the way, you can't do much with the bread. What's odd though is that you can destroy it with the Short Circuit like destroying a projectile and you can reflect it with your airblast.

The one I got is right here v

http://www.teamfortress.com/loveandwar/