Barney: What's up, bro?
Marshall: Wait, how did you... with the security?
Barney: I'll explain.
[flashback:]
Security Guard: Tell me why we shouldn't call the authorities right now?
Barney: Go ahead, call 'em. But first, can you show me the rule that says you can't drive a motorcycle on the casino floor?
Security Guard: [chuckles]
[later:]
Security Guard: It's not in here.
[Barney confidently puts his feet up on the table]
[A man places a sign reading "No motor cycles on the casino floor"]
Future Ted: [v.o.] And, kids, that sign is still there to this day.