Dads out there that loved video games back in the day, might enjoy playing them again using and emulator and ROMs. An emulator is a program you install on your computer that acts like another piece of hardware such as a game console, a different computer, or an arcade game.
My favorite emulator is called MAME. It emulates the hardware of classic arcade games. On you find and download the ROMs (file containing the original game code) and load them up in MAME, you can play all the classics such as Pac-Man, Dig Dug, Donkey Kong, Super Mario Brothers, Zaxxon, Defender, and all manner of other retro gaming goodness
The beautiful thing about emulators is that you're not just playing a re-creation of a classic game, you're playing
the actual game!
People even go so far as to build their own arcade style cabinets with real arcade controls and load the insides up with a computer running MAME. Because classic games were pretty simple compared to today's games, it doesn't take a powerhouse of a computer to run them.