Q: Which letter is not me?
A: U.

Q: What has a neck, but no head?
A: A bottle.

Q: Why do birds fly south for the winter?
 
A: Because it's too far to walk.

Q: What flowers have two lips?
A: Tulips

(After teaching about telling time)
Teacher: What time is it?
 
Students: Umm, eight fifty-nine?
 
Teacher: Nope.
Students: About nine o'clock?
 
Teacher: No.
Students: What then?
Teacher: It's time to go home