FOUR RIDDLES

1. Why is a medium good company?
2. Why is a realtor good company?
3. What do you call a party for doctors?
4. What do you call a party for physicists?

Answers:

1. He tries to raise your spirits.
2. He has a lot to offer. 
3. A medicine ball
4. A nuclear blast

Credits:
#1: Trip Payne
#2: Marjorie Berg 
#3-4: Gene Newman