Hmmm...good question
1. Cracking open that 2600 as a kid on Christmas and all that followed
2. Resident Evil
3. Fri/Sat nights at the arcade Street Fighter Alpha 2 with 15 people deep waiting to challenge
4. Final Fantasy VII
5. Left for Dead co-op with a few friends drunken nights
If I had time to go over to my buddy's house now whom has a slick VR rig I'm sure that would be in the mix.
Dammit, Super Mario 3 in there of course too