I was just playing through Mega Man 4 the other day, and man does the Mega Buster still feel good. The whole game does actually — all of the NES titles have aged quite well.
If you want to relive those moments in real life, ThinkGeek is now selling its Mega Buster replica for $79.99. To recap, it has flashing lights and sounds, so you can run around your house and go “pew pew” to your heart’s desire.
Mega Man Mega Buster Gun Replica [ThinkGeek]