"I'm on a broom, and I've got the speed of a werewolf," Remus says to himself, "I bet i can get in there, get some, and get out without her even noticing. Alakazam, thank you ma'am!"
So Remus zips in the window, does his thing, and zips back out and goes on his way, a satisfied man.
Lily looks up and says, "Did you feel a breeze?"
James pulls off the Invisibility Cloak and says "I don't know, but my arse hurts."