Now you're on the trolley
Expression used when someone FINALLY gets the gist of what you're telling/teaching them to do. Usually said for laughs or weirdness/British points.
Idiot: So you put the acid in and THEN the cheese?
You: No, BACON, then cheese
Idiot: oh THAT'S how you make a cheeseburger!
You: Now you're on the trolley!
You: No, BACON, then cheese
Idiot: oh THAT'S how you make a cheeseburger!
You: Now you're on the trolley!