Law of Demonstration
The law of demonstration is a subset of Murphy’s law and works in two ways. A functioning process will not work when demonstrated, but a broken process will work perfectly. E.g. when trying to show IT an issue your computer is having, the issue will not occur.
The Urban Dictionary Mug

It’s a great way to store my pencils.
I used this instead of condoms It didn’t work and now my nephew is my son
Ordering was very easy and the delivery to a different address then the billing address was done effortlessly with complete correct order. Was delivered before estimated date which was very exciting. Good job well done by all.
Funny stuff! I wish the mugs cost a bit less, I'd buy more. There's an almost unlimited supply of clever slang.
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Due to the personalized nature of your order, we don't accept returns for change of mind or sizing issues.
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