Fun Riddles

Question: A semi truck is driving down the highway but the driver isn't paying attention. He goes under an overpass that is too short for his truck by only inches and gets stuck. He thinks it's going to be a very costly mistake but one of his friends happens to pass by and explains to him how he can get out in the matter of minutes without any help.

What does he suggest?

Question: You have a cube made of 10 x 10 x 10 smaller cubes, for a total of 1000 smaller cubes. If you take off 1 layer of cubes, how many remain?

Question: Paul is 20 years old in 1980, but only 15 years old in 1985.How is this possible?

Question: There was once three trees. The first tree did whatever the third tree did, and the third tree did what ever the second one does. What happens if tree number two gets cut down?

Question: Drop me and the world will shatter,
and you can always find me where you empty your bladder.

What am I?