Avengers, Assemble Meme Generator
Someone posts "free cake in the kitchen" in the office chat. Within ninety seconds, people you've never seen in four years are queuing with plates.
You ask the family chat for help moving house. Silence for a week. Then at eight on the day every relative turns up at once with a van and an opinion.
Your one friend texts "outside". Five more appear behind them, all mysteriously in the area, all hungry.
One reply-all on a company-wide email. Then three hundred people reply-all asking to be taken off the list.
Why it caught on: Avengers: Age of Ultron (2015) cut Cap off mid-line, and when he finally finished it in Endgame (2019) cinemas cheered like it was a cup final.