not necessarily your favorite games, but ones that left a mark in some way.
on my shortlist:
mgs1
original halo
half life 2
rayman 2
mario 64
zelda OoT
original shenmue
original sonic the hedgehog (christmas morning on a spankin' new genesis playing with my brother...can't beat that)
Considered putting morrowind on there, but remembered I didn't enjoy it all that much on first play on xbox. Years and years later on pc was great though!