[Request] Jokes about time travel.

Back in the late 90's - early 2000's, there were time travel jokes floating around the internet that were clean yet funny (to my 15 year old self). They all started out similarly. I remember one that went something like:

*"When traveling back in time, don't hang your arm out the window. It'll turn into bone."*

There was another that went something like...

*When traveling back in time, don't make eye contact with those traveling toward you because..."*

...but I don't remember the punchline. Are these familiar to anybody?

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