Bellboy makes me think of Some Like It Hot, but not just one scene.
That’s the one I was thinking of. (But @Guest-starring_Id 's guess is correct, too, now that I think of it.)
New one:
The Philadelphia Story
Yep.
How about:
and
I don’t know how difficult this will be…
Gallops
I see your Yar and raise you:
Yarp?
Yes??
dip-tet
Yawp!
Raising Arizona
Cornbread.
Raising Arizona.
Horsehead (kind of one word)
Funny line from Aliens.
Chasing Amy
Army of Darkness
Nope.
Total Recall?
Hot Fuzz, although I think it’s in more than one scene? Makes me think of the ‘Yarp…Narrrrp?’ scene though.
Melon