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Warm beer and cold coffee are the same temperature
(discuss.tchncs.de)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.
Just make sure you go to a nice one (I'm not of any help, I'm not the Christmas market type of person), some are really touristy/fake.