LOVE THIS.  It's well worth two minutes to watch!

This happened on Disability Awareness Day at Fenway Park in Boston.  The guy singing the National Anthem has autism.  From what I can tell, something happens 30 seconds in that makes him start laughing.  When he can't quite hold it together, the crowd joins in and helps him finish.

His laugh will probably put a smile on your face.  If it doesn't, then the crowd helping him ought to put a smile on your face and warm your heart.