|List of objects|
Boo-boo Keys makes an appearance in the episode "Bubble Buddy."
The Boo-boo Keys are four of Harold's gold-colored keys all chained together.
They appeared in the episode when the citizens of Bikini Bottom were about to pop Bubble Buddy, SpongeBob then told the people that Bubble Buddy was his friend and asked the town if they've ever had a close friend. From there, citizens started bringing up material possessions that they consider friends, including Harold who brought up Boo-boo Keys.