Anything where the term, “Flower Arrangement” is part of the sentance, I go into my impersonation of D.P. Gumby
Well now, isn’t that special. What might cause such behavior? Could it be…SAAAYTAN?
I tawt I taw a puddy tat!
“I do not thin’ that word means what you thin’ it means.”
(in a bad pseudo-Spanish accent)
“A whaaaaaat?”
- in a whiny voice, after Hooper advises the local yokels on the dock that the shark they caught is not a mako, as they suspect, but a tiger shark.
(Jaws)
Slays 'em every time.
Rich Corinthian leather.
“Thank you, come again.”
Vee haff vays of making you talk
Listen verrry carefully… I shall say zis only wurnce
– both from “Allo Allo”
Whooooooo the f*&%$ are yeeeewwwwww?
Scottish accent. (Trainspotting)
All these, and more.
Lately I’ve taken to saying “I dunno” with an odd accent that I can’t place, and I’m not sure where I picked it up from. But I expect I got it from somewhere.
‘Clam Chowder’ - from the Simpsons, the conflict between the waiter and the junior Quimby. “Say chowdah!” “Chow-dair.”
Alllllllllllll-righty then!
Oh, may I? (Steve Martin as a waiter in The Muppet Movie)
The new phonebook is here!!
Everytime the situation arises where I have to say “It rubs the lotion on its skin or else it gets the hose again,” I find myself trying to sound like Ted Levine.
I’m a little worried- how often does this situation arise? 
And I forgot;
Well, excuuuuuuuuuse me!
And:
“Wha happ’n?”- like Fred Willard’s character in A Mighty Wind
“Me so horny. I love you longtime.”
[nelson]Haw haw![/nelson]
“Dy-no-mite!”
“Hi-ho, Kermit the Frog here.”
“Ni!”
“Khaaaaaaaaaaaaan!”
“Nanoo nanoo!” along with “Shazbut!”
“We represent the Lollipop Guild” and the obligatory “I’ll get you my pretty, and your little dog too.”
“Da-hilk!” (my best attempt to spell Goofy’s laugh)
(back to work)
Have fun stormin’ the castle.
[Elvis]Than’yuh. Than’yuh vuhr’ muh’.[/Elvis]
Inconceivable!
Also: “bad” pronounced as “beeyad”. My ex-roommate used to scold her odious little dog by shaking her finger and saying in a high pitched voice “Beeyad! Beeyad girl!” My boyfriend and I often torture each other with this and then laugh hysterically. Maybe you had to be there.
My fiance and I always say “sewauce or su-awce” in a bad New Jersey accent. We need more barbecue sewauce.
Sunday SUNDAY Sunday!!!
After “the new phonebook is here” is “I’m somebody!” and then usually, “all I need is this chair”. I don’t even like that movie that much. 
We tend to mispronounce words, like on street signs to get each other to laugh: Chouteau Street becomes Ch-oh-ew-tee-ay-ew S-tah.
“We’ll sell you the WHOLE seat but you’ll only need Thuh E-E-EH-DGE.”
"Walkieeees!" -Barbara Woodhouse, TV dog trainer