2 years old.
Cow: "Mooooove over"
Sheep: "Naaaaaaa."
or
None, because people who glow in the dark don't need light bulbs.
Note: Topical to the Chernobyl Reactor disaster of 1984.
or
I've been framed.
or
Because he saw the salad dressing!
or
Shocked.
or
The wedding wasn't much, but the reception was incredible!
or