Fun Riddles

Question: What is heavy one way and not the other?

Question: Your driving a school bus and you pick up five kids and to get back to the school you have to turn right twice straight for three miles then make a left and drive four more miles straight and your there, but what's the color of the bus driver eyes?

Question: what is a bud inside the house and flower outside the house

Question: What's strong enough to smash a ship but is still afraid of the light?

Question: I fasten to walk,
and unfasten to stop.

What am I?