Ultimate Parodius

Ultimate Parodius is a two-in-one shooter that's been popular in Japan on the PC Engine and Super Famicom. It's actually a zany spoof of Konami's own Gradius series; you blast through skee ball prizes and goofy aliens. As you wipe out enemies, you get power-ups that increase your firepower and defensive capabilities. If you're a fan of shooters, this might appeal to you. The soundtrack has an array of wacky Big Band tunes that your grandpa can appreciate.