My wife screams when I fall from a tall ledge or building in 3D platforming games.  Falling off freaks her out.
My irrational fear is that games on a physical format will soon be history.  I cringe at the thought of a digital-only marketplace, where our collections will fill a hard drive rather than shelves in our game rooms.  The thing is, it's not really irrational, since it's coming.  The next-gen XBox/PS systems will most likely push downloads over disc purchases; some used games are already being gimped if you try to play them online.  The newest iMac doesn't have a disc drive.  Mobile devices are pushing digital-only games like Angry Birds and crowding out the 3DS and Vita.
The day I can no longer walk into Best Buy and buy a physical game is the day I'm no longer a modern gamer.  On that day, I'll revert to the thousands of games on cart and disc that I have yet to play.