What is long, green, and has 16 wheels?
Grass, I was lying about the wheels.

What's big, white, and can't climb trees?
A dishwasher

Whats big, red, and eats rocks?
A big, red, rock-eater.

Whats big, red, and eats pebbles?
A big, red, rock-eater on a diet.

Whats big, red, and looks like a bucket?
A big red bucket.

Whats big, yellow, and looks like a bucket?
A big red bucket in disguse.

Whats big, blue, and looks like a bucket?
A big red bucket holding its breath.