- Eat an ice cream cone.
- Hopscotch
- Tickle some one
- Dance
- Sleep
- Paint your toenails
- Blow bubbles
- Have a silly string fight
- Eat a s’more
- Bow for a well-earned applause
- Finger paint
- Jump on a trampoline
- Hold a three-day-old kitten
- Listen to Boom Boom Boom Boom by the Vengaboys
- Sing “Happy Birthday”
Just for today, everyone be 10% less cool & 10% more open-hearted.
fabandfanciful.wordpress.com 
You may not be able to sing happy birthday angrily, but maybe grudgingly, or unenthusiastically.
Unless you’re talking about the pseudo-drunken version, in which case, no, you can definitely not sing that in any other state but happily. 🙂
I like this list. If it were on Facebook, I would most definitely hit the thumbs up icon. 🙂