I'd imagine this might come in handy.

So, remember last week how I was talking about time-travel?  Wow, how many blogs do you read that can say that?  Anyway, I mentioned a time-travel cheat sheet, but I think this is better.  How many times have we seen a time traveller go back in time and show off something fancy, like, say a lighter or a flashlight, and suddenly be the local wizard?  Now, imagine you had the aforementioned cheat sheet, in the form of a t-shirt.  Yeah, that's what the Time Traveller Essentials T-Shirt is all about.  Also?  Pretty funny and cool.