Safety Not Guaranteed
Safety Not Guaranteed is a fad that originated from a newspaper ad from a person asking for someone to accompany him in time travel. The exact ad is as follows:
"Wanted: Somebody to go back in time with me. This is not a joke. P.O. Box GTFO Oakview, CA 93022. You'll get paid after we get back. Must bring your own weapons. Safety not guaranteed. I have only done this once before."
An image of a stone-faced young man wearing a mullet is placed on the left of the text, although this was not included in the original newspaper advertisement. The ad, which insists that it is not a joke and even provides contact information, warns that a potential respondent's safety is not guaranteed as he only tried once before; the image is accompanied by Paul Engemann's song "Push It To The Limit" from the movie Scarface (1983). The nature of the man's hair and serious tone of the ad (This is not a joke) adds to the humor.
Sites often show the time traveler in different time periods, including the civil war. Most recently this has evolved into a variant of the Wikipedia vandalism fad, in which users would try to edit wikipedia material such as the "safety" entry, with such footnotes as "when you push it to the limit, safety is not guaranteed". 
The Time Traveler has become a popular icon of YTMND. Several fad spin offs placed the Traveler in various time periods.
The fad mixed with the PTKFGS fad, with the creation of "safety not guaranteed changes internet history", which depicted the Time Traveler going back in time and replacing YTMND with PTKFGS, creating the Alternate Universe Fad.
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