S10E5: Back to the Pilot
Brian, there's one rule of time travel, and that is,
do not alter the past in any way or the consequences could be dire.
Yeah, where'd you hear that? Quantum Leap.
That guy changed the past all the time!
Quick, Brian! Get down!
Hey, Peter, my thing went off. Your thermostat okay?
PETER: Yeah, it's all right. Hey, is my kid over here?
MAN: Forget it. False alarm.