"Do you think it's easy being an optimist

 A group of elderly Jewish men meet every Wednesday for a

coffee and a chat.  Usually, their discussion is very negative.

One day, Moishe surprises his friends by announcing, loud and clear, "You know what? I've now become an optimist."

But then Sam notices something isn't quite right and he says to Moishe, "Hold on a minute, if you're an optimist, why are you looking so worried?"

Moishe replies, "Do you think it's easy being an optimist