Place this clip right after the reveal of the petty problem, before your reaction line lands. Follow it with the SpongeBob Fail Sound Button for a second flop, or precede it with the Dun Dun Dun Sound Button to build fake stakes.
About this sound
This clip is Gumball putting on an exaggerated fake cry, a drawn-out whimpering sob that lasts about five seconds without any real tears behind it. It feels funny and melodramatic rather than sad, turning a small complaint into full cartoon distress. It comes from The Amazing World of Gumball, where Gumball uses the act to get sympathy.