— Harold, "Bubble Buddy"
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Boo-boo Keys appear in the episode "Bubble Buddy."
The Boo-boo Keys are four of Harold's gold-colored keys all locked together in a ring.
They appear in the episode when the citizens of Bikini Bottom are about to pop Bubble Buddy. SpongeBob tells the people that Bubble Buddy is his friend and asks the town if they have ever had a close friend. From there, citizens start bringing up material possessions that they consider friends, including Harold who brings up his Boo-boo Keys.