Several things. I played Uke as a teenager, and learned from an Arthur Godfrey book. I stopped playing for 40 years.
I saw Petty Booka playing "Sophisticated Hula" on Ghoul A Go Go, a cool retro public access kids show.
Last year, a man at a old time baseball ga,e pulled one out and started playing.
There's a ukulele store about 4 miles from my house, and I got it in my head I wanted to play again. That was about a year ago, and it's been a great adventure ever since. Not only did I get an therapeutic instrument, get to sing again, I got a new social circle.