On Wednesday night's episode of Late Night, Seth Meyers had John Stamos, Henry Cavill, Keri Russell, and John Goodman give valuable life advice to their younger selves. The stars' words of wisdom will resonate with anyone who wishes they'd known to kill that duck, or get a haircut in the second season of Felicity when they were young.

Ah, to be young and able to kill a duck again!

Sources: Late Night with Seth Meyers