Mel Brooks: 'Spaceballs 2' Posters Ain't Mine ... But I Love It!!!

Mel Brooks swears he didn't mastermind a viral marketing scheme for "Spaceballs 2" by plastering posters in the NYC subway ... but he couldn't be happier it happened.

Brooks laughed off the rumors Sunday in Beverly Hills ... but says he's thrilled the flick is held in such high esteem by the youngins.

As for the long-awaited sequel -- Mel plays coy, but it's definitely on his mind.