An across-the-room connection with a girl or guy, where you know you'll likely never encounter them again. You want to talk or flirt with them but you don't, it just stays a subtle connection. Unless it's all in your head
Bro I just had this restaurant theory with a chick who looked like the dragon queen from game of thrones!
Man that ugly girl was just eye-fucking the shit out of me, she probably thought we were having the old restaurant theory. God bless her!