Five pound box of tens
(Actually, I'm not feeling a lot of holiday stress. It's still a good exercise.)
1) My son has his mother's ear for music. Seriously... I have an almost-two year old who can sing the opening of John Coltrane's "Giant Steps."
2) Christmas blues/R&B songs. This is a whole other post (in fact, it already is), but I love Christmas music, and I especially love anything true to its roots.
3) Psych. I'm not saying it's great art, but it makes me happy.
And sure enough, it's hard to defend why these three and not numbers 4-10. It's not like these are ranked by level of happiness caused. But it does put me in the right frame of mind to get to work and remind my staff what a great year we had, and how thankful I am for them.