This happens whenever I need some one to believe me

HAPPENS EVERY GODDAMN TIME

Always

yupp happens to me alot too:)

Happened to me today... I guess I'll just have to harness this skill for poker.

And you know what has happened yet you continue smiling or start giggling like a maniac.

Also when nervous or something horrible has happened some of us laugh for no reason it seems. It is actually the brain giving you a dose of endorphins to help. Just unfortunately a side affect is laughing or indeed smiling. :-)

Yes