Coolest one-word film dialogue

For me, the word in that movie was “Asshole!!”

Antici

pation.

The Rocky Horror Picture Show

“Whiskey…”

…as gasped by Indiana Jones in an early scene of Raiders of the Lost Ark.

Possibly the most weaksauce contribution to this thread:
(from TV)
“SHAAAAAARRRRRR-RRONNN!!!”

you can guess that one, huh, Dante G?

“Superman”

–the Iron Giant

“Swordfish!”

Groucho in “Horse Feathers”