Just in case. . .

Say you end up transported back in time, you can read English, and you're still on Earth: this T-shirt is your crib sheet for a successful career as visionary, inventor, and entrepreneur! Either that, or it will get you burned as a witch.

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View larger here.

Wear/read/implement at your own risk. . .

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Reading that, I'm fascinated by the smaller details of technology that so much of that relies on. What someone really needs is a guide to all the tools of whatever time they land in.

Yeah, a lot of that is really pretty useless information - you'd have to find an alchemist to implement it for you. I think that's part of the joke, but I still found myself wondering where exactly I was supposed to get a microscope to look for penicillin. . .

The wing thing won't get any time traveller off the ground, since it's complete BS. Proof: planes can fly upside down.