Riddle #782

Question: Two people are born at the same moment, but they don't have the same birthdays.

How could this be?

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?