If you want to see something fun with Mega Man 2, there's something you can do if you have the Switch version of the classic Legacy Collection. If you equip the metal blades, hold down both the left and right directional buttons and then fire. The metal blade will just hang there in air, motionless. The game clearly doesn't know what to do with the inputs since they're physically impossible on an NES controller. It's not like other games where it will only register the last actual input, Mega Man 2 seems to account for both of them at once, hence the metal blade floating at a standstill.
There's no real practical use for it, I just think it's neat.