Ziggy says that there's a 97 percent chance that the person wearing this shirt is a time traveller. — T-shirt seen at a Quantum Leap convention
Things Not to Say to Dr. Samuel Beckett #57: "Get a life!" — Roberta Kwong, Usenet
Theorizing that one could travel through Boston on the MBTA, Dr. Sam Beckett stepped onto the Green Line... and vanished! Trapped on the 'T', Dr. Beckett finds himself leaping from station to station, using 'T' Passes that are not his own... His only guide on the journey is Al, who appears in the form of a ticket checker that only Sam can see and hear. — Jennifer Kirtley and Michael Escutia, Usenet
Theorizing that one could travel through increasing states of cleanliness, Dr. Samuel Beckett put his socks into the washer... they vanished! Dr. Beckett finds himself leaping from day to day, wearing clothes that do not quite match... — Ken Kaufman, Usenet
Theorizing he could space travel within his own galaxy, Captain Jonathan Archer stepped onto the bridge of the Enterprise and vanished...
I feel like I'm in a bad episode of Quantum Leap.
— Buster Bunny, Tiny Toon Adventures
In the first episode [of Time Trax], he travels back to 1987 to prevent the production of Quantum Leap, to make his series look original.
— Jay Leno, The Tonight Show, 1/21/93
And some sad news. Our own network here, NBC, has canceled the television show Quantum Leap.
It was a good show, but it was ranked 82 out of a hundred shows. It was 82nd. It was 82nd. Boy, not only are we losing Cheers, our highest rated show, we're also losing Quantum Leap, our second highest rated show. This is terrible! It's terrible! Oh, man...
(Audience: laughter and applause)
(looks up into audience) All the NBC brass are here. I'll go get a job with Allstate in the morning.
— Jay Leno, The Tonight Show, 4/26/92
"Uh, Sam, Ziggy says you're called Old Man Winters and there's an 85% chance you're here to stop those... pesky kids from foiling your plan?"
"Sam, Ziggy says there's an 80% chance you can't leave Woodstock until you bone these hippies!"