Fool me once, shame on you. Fool me twice, I'll sleep with your partner.
There's no denying it now: Rust finally went ahead and moved Marty's lawn, the result of which had both men cursing out Maggie.
Marty was shocked to learn about Maggie's betrayal, and despite having just been caught cheating for a second time, had the gall to call his wife a whore.
Let ye without sin cast the first stone and all that. Marty dished out one of life's hard truths to his daughter's friend, but was arrogant enough to think it wouldn't apply to him.