Thanks for the thread, Toshi, lots of good personal stories being shared in here!
mrmike came from a boatload of encounters with other Michaels - it was one of the more popular names for the boomers. Growing up there were so many Michaels that we resorted to things like Big Mike, Little Mike, Mike A., Mike B., and so on and so on. At one point I lived in a house with three other Mikes and we all adopted variations to distinguish ourselves.
With me it stuck. I was mrmike with business associates for years. In a friendly way, "That's mrmike to you" always seemed to recognize a world full of Michaels. To MrMike from Nashua, NH, I'm pleased share a moniker.
My avatar is picture of my Dad, a WWII P-47 pilot in a restored Thunderbolt at a reunion of his fighter group. He's 95 years old this December, and still flies Light Sport aircraft.
Like others have said, this forum is a wonderful way to share our hobby and our lives.
mrmike