Last time I visited the USA I'd just read a John Gruber post where he'd explained tipping is not complicated at all, just tip 20%. He said he always had done th

Last time I visited the USA I'd just read a John Gruber post where he'd explained tipping is not complicated at all, just tip 20%. He said he always had done this, and that basically all Americans knew this was what you were supposed to do. I enjoyed the trip more than previous trips because I now had this new superpower, I felt like an insider who no longer felt anxious. I would sort of casually and knowingly do the 20% thing, but sadly since it doesn't happen in advance I suspect I was still treated as a foreign guy who wouldn't know how much to tip :(