IANAN, but living abroad when I was about 25 really improved my humility. I'm used to being quick-witted, knowledgable, and generally good with people. When I got to a place where English is not the default language, I was essentially an idiot---I was confused a lot, unable to make jokes, and little kids laughed at my attempts to, say, order a gyro.

It all clicked when I was lamenting it to my girlfriend, who said (with real affection), "well, how much of what you say is actually valuable?" Right then I realized how much of my time I spent trying to convince people how quick-witted, knowledgable, and easy with people I am.

Now I talk less, let jokes (even good jokes!) go unsaid, and am better with people.