It has been my experience that Murphy is more likely to be there if you can't access a store or if there are no vending machines that have what you need.
I took just one class at the MacGyver School of Engineering.

It was on vending machine items.
Jeanette Isabelle
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I'm not sure whose twisted idea it was to put hundreds of adolescents in underfunded schools run by people whose dreams were crushed years ago, but I admire the sadism. -- Wednesday Adams, Wednesday