Place this clip right after the reveal in a reaction edit, before any commentary resumes. For a bigger pile-on, follow it with the emotional damage meme for a second hit, or end the sequence with the bruh soundboard button once the chaos settles down again.
Über diesen Sound
This clip is a lone voice shouting an elongated Mamma Mia exclamation lasting just over two seconds. The stretched delivery turns a familiar phrase into pure disbelief, making it feel funny, dramatic and a little exasperated, like a reaction that is deliberately too big for the small moment that caused it.