Welcome, novice quantum leapers. This is your one-stop shop for all things quantum leap-related, minus the physics.
Here's the deal: you can't actually change the past, but you can pretend you did. It's all about the art.
Quantum Leap Bad Ideas (don't do these)
Or, if you're feeling particularly reckless, check out Quantum Leap Rogues Gallery.
And, for the truly adventurous: Quantum Leap Theory of Epic Fails ( warning: may cause spontaneous combustion)
Disclaimer: Quantum leaping is not actually possible, but it does make for a good story.
Side effects of quantum leaping may include: reality distortion, time dilation, spontaneous combustion, and/or existential dread.