My first email was Firstname_Lastname@aol.com. When aol became insufferable and a challenger appeared, I made Firstname.Lastname@gmail.com.
Gmail lets you add "."s anywhere and it’ll still work, so all my spammy or whatever things I sign up for are Firs.T.Nam.E.L.Astnam.E@gmail.com or some random variation. Makes it easy to delete all the junk.
Idk which was first, but it was either blue ba dee or walkin on the sun. Both were absolute bangers to me as a kid.