From the fun guys at xkcd:
I swear I have done this at MGF Metropolitan Mall, much to the displeasure of the security staff present. But what the heck!!
Meanwhile check out their disclaimer (emphasis mine):
Warning: this comic occasionally contains strong language (which may be unsuitable for children), unusual humor (which may be unsuitable for adults), and advanced mathematics (which may be unsuitable for liberal-arts majors).
ROTFL!!
