Goon: What the fuck is this?
[Picks up a bowling ball hesitatingly.]
The Dude: Obviously you're not a golfer.
Walter Sobchak: Nihilists! Fuck me. I mean, say what you like about the tenets of National Socialism, Dude, at least it's an ethos.
Walter Sobchak: Shut the fuck up, Donny.
The Dude: Where's the fucking money, Lebowski?
Walter Sobchak: This is what happens when you fuck a stranger in the ass!
Walter Sobchak: Smokey, this is not 'Nam. This is bowling. There are rules.
The Dude: At least I'm housebroken.
Jackie Treehorn: Refill?
The Dude: Does the Pope shit in the woods?
The Dude: Hey, careful, man, there's a beverage here!
Walter Sobchak: You want a toe? I can get you a toe, believe me. There are ways, Dude. You don't wanna know about it, believe me.
The Dude: Yeah, but Walter...
Walter Sobchak: Hell, I can get you a toe by 3 o'clock this afternoon... With nail polish. These fucking amateurs.
The Dude: Walter, I love you, but sooner or later, you're going to have to face the fact you're a goddamn moron.
The Dude: My only hope is that the big Lebowski kills me before the Germans can cut my dick off.
Jackie Treehorn: People forget that the brain is the biggest erogenous zone.
The Dude: On you maybe.
The Dude: Yeah, well. The Dude abides.
The Stranger: The Dude abides. I don't know about you but I take comfort in that. It's good knowin' he's out there. The Dude. Takin' 'er easy for all us sinners. Shoosh. I sure hope he makes the finals.
The Dude: I only said I THOUGHT she kidnapped herself. You're the one who's so fucking certain!
Walter Sobchak: That's right, Dude. 100% certain.
Maude Lebowski: Do you like sex, Mr. Lebowski?
The Dude: 'Scuse me?
Maude Lebowski: Sex. The physical act of love. Coitus. Do you like it?
The Dude: I was talking about my rug.
Maude Lebowski: You're not interested in sex?
The Dude: You mean coitus?
Jackie Treehorn: Interactive erotic software. The wave of the future, Dude. One hundred percent electronic!
The Dude: Yeah well, I still jerk off manually.
Answer: Themmen plays a background bowler in pretty much all of the bowling scenes. I don't know if this is necessarily worth a credit, but I guess his agent disagrees with me.