It's All Fun and Games...

I was on thin ice on pay day when I set a mouse trap in my kitchen.  I was taking a risk with my life but did not have a clue.  I was the mastermind who thought it would be perfection to connect four traps together to catch the mouse, but I was sorry and needed an operation because in the dark I had to scrabble for the cheese that fell off and only found trouble when the traps snapped down on my fingers.

What's the common factor?