My secret dream is that someday I sing a song with the Muppets on Sesame Street. It will never happen, since I'm not famous (nor do I have plans to be.) Maybe if I moved to New York, made friends with the crew, got a gig as a stand-in or something...no. Probably not.
(though honestly, if Sesame Street is strapped for cash, they could make a KILLING charging for just such an experience.)
Anyhoo, when I want to smile, I watch the below video. Yes, I know it's a year old. I don't care. I watch it, and then I dance around my place singing, "BWAK BA BA BWAK! BWAK BA BA BAWK! OhhhhhooooohhhhhOOOOOHHHHHHHHH! We're counting to FOOOOOUUUUUUUUUURRRR!"
I dare you to do it. You will smile at the end.