I'm no good at buying presents. I'd rather people told me what they wanted and if they ask for money that's great. But sometimes I get it right.
First Christmas with DH (then boyfriend of 11 months) I bought a special edition Scalextric 24-Hour Le Mans set with cars with working headlights. He'd said much earlier that he always wanted one as a child. It wasn't in a crafty way but more like "things your parents thought were pointless and too expensive." He actually cried when he opened it. I'd never had that effect on a man before 
We stayed up all Christmas night racing in the dark. Ambushes from my cat George were a thrilling hazard.
The other one was a £10 box of liqueur chocolates for my dad. He had Alzheimer's and it was pretty bad. My mum washed and shaved him and bought him a smart Noel Coward-type dressing gown in maroon velvety material to put on over his pyjamas so he would look nice on Christmas day without having to get dressed.
After dinner I said: "Let's have one of your chocolates, Dad," and he .said: "Yeah! All right! Oh!" He'd been holding them so tightly they'd melted and he was upset. But we all had some squashed chocolates and the dressing gown came up fine in the washing machine. He was gone the next year. That's not a sad memory. Far from it. My dad loved liqueur chocolates but not as much as we loved him.
What lovely Christmas present memories either giving or receiving have you got?