Here are some great Chuck Jones expressions from "Hair-Raising Hare" and "Haredevil Hare", two of my favorite cartoons. I've included pictures and videos of these classic moments. In the first set of pictures Bugs Bunny is frightened by Gossamer, a giant, red-haired monster, and in the second he reacts to a terrifying rocket ship ride to the moon.
"Hair-Raising Hare" (1946)
"Haredevil Hare" (1948)