For me it would be unexpected thoughtful gestures. Just this past week my hours reached 45 and I was sent home due to new OT policy. So I go right home, secretly grateful as it's getting pre-monsoon nasty hot here - only to find SO in the kitchen attempting to make schnitzel from a recipe Astrid sent him.
It didn't turn out too good, much like my attempt to make chicken mole once. But that's not the point. I was so deeply touched it's like I fell in love all over again.
Gotta say - as much as I bitch and complain, in this one area I truly did win the lottery.
Rob