Because you're a people person: salute all the lovely people who attempt to interact with you with a friendly middle finger. The safest way to do it is probably with this totally rude (but totally funny) mug.
MICROWAVE & DISHWASHER USE:
These are steel under enamel. So please don't use them in the microwave unless you want to create a localized lightning storm in your kitchen and pretend you're Harry Potter. Or Voldemort.
They are dishwasher safe and won't fade... though keep in mind that metal does rust, so any chips in the enamel will allow the steel underneath to rust if you put it in the dishwasher. But in general... dishwashing should be fine.