Okay, real answer:
I often tend to say very Kermit-like "Oh good"
Aside from that and other odd Muppet quotes, a lot of my catchphrases tend to be fave lines from my fave obscure songs:
"Prima amore - WOW!" (Eurythmics, Wide Eyed Girl)
"Swelligant" (Debbie Harry/Iggy Pop, Well Did Ya Evah?)
...and whenever i hear a Shakespears Sister song pop up somewhere unexpected, i always shout/sing out "IT'S SHAKESPEARS SISTER - YEAH-HAH!" the same way Joniece Jamison adlibs during the fade of Dirty Mind
...and i'll sometimes refer to a group of plastic trendy girls as "a pack of blonds" (courtesy Julie Brown)
I'll sometimes greet someone (especially if i know they're a Twin Peaks fan) with "On top of the morning to you"
and i never swear in standard four letter words (too much a gentleman) so i instead use Farscape curses or "Oh, Ju-dy Ten-U-da!" (one day i just randomly thought how great sounding a swear phrase that sounded like and it since stuck)
...again from my Obsessed Muppet Freak side, when something confuses me, i tend to mutter "Chicken soup? What is this? I don't get it!"