Shoot the core!
I spent an hour or two this morning relaxing, playing a few classic arcade shoot-'em-ups by way of emulation. However, the unfortunate side effect of pumping an unlimited stream of quarters into games like DoDonPachi II, Mahou Daisakusen, Esprade, and Mars Matrix is that I have perpetual blossoms of blue and pink neon bullet patterns spreading behind my eyelids whenever I blink.