Keeping up the Right Appearances

Snoopyism:

Linus sees Snoopy all down in the dumps and says "What's going on Snoopy?"

Snoopy says "Going through some tough times."

Linus says " That's too bad, how do you feel?"

Snoopy says"Great!"

Linus says " If you are doing great in these tough times, why so glum?"

Snoopy says"I read somewhere that when you are having bad times, you are supposed to look all droopy."

Why can't we go against conventional wisdom that says we have to be sad, depressed, and in pain. I am not talking about real tragedy or loss. If you have good feelings during challenging periods, what can't you smile or laugh? What have you got to loose except confuse someone like Linus.