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.