Bob is a hormone monster. He appeared in "The Department of Puberty".
In "The Department of Puberty", Bob was seen at work at The Department of Puberty, on an elevator, talking to another hormone monster. Bob said that his mother-in-law came to visit last weekend and insulted him. Bob recapped his mother-in-law's insult, reciting "You couldn't get a kid a boner if you jerked him off, yourself." While Bob hated hearing her tell him this, he still admitted that it was true.