Riddle #378

Question: If a farmer has 5 chickens, two horses, and a wife.

How many feet are on his farm?

Question: What do you call a sad bird?

Question: What kinds of balls do dragons play soccer with?

Question: How are doughnuts and golf alike?

Question: What can be broken but never forgotten?

Question: People see through me, but none pass through without killing me. I can be anywhere, and can be seen double or single. What am I?