And why always just one?
Use your imagination.
Mainly because that is the idea with a joke of that style, filling in the gap yourself is generally much funnier than if they said something.
Some similar examples:
“I haven’t done a single thing wrong in almost 24 hours, and I’m including sex last night. Here’s Avery’s thank-you note.”
“Ugh, she likes that?”
“No, but she respects it when it’s done correctly.”
“Oh no, you guys start with that?”
“Look, we got B.F.F. bracelets.”
“You guys are best friends forever?”
“That’s not what that stands for. [whispers]”
“Why would you celebrate that?!”
“Nope, do not put a hyphen in YouFace. There are definitely faces here, but they are not being treated with respect.”
“I gave her the ottoman, and she walked out.”
It’s like the grapefruit technique, but crumblier.
Sex stuff
Something very different than what you do with the three shells
Use it to add the missing NSFW marking…