I saw something in youtube that made me remember that retard on tv.
"If you are depressed just be happy."
damn. mindblown.
realistically there are just two reasons why one would suddenly be happy after a depression.
1.) that person gets help. real help.
2.) The end is near, and that's relief.
So if someone is suddenly happy after a case of extreme depression.
be sure. be very sure.
you might never see them again.