An excellent set of images to help you remember the SOLID principles.

At this point, naturally, I removed my pants and the guy started screaming at me about police and indecent exposure. Confused, I said, “look, I’m just trying to pay you — I’ll hand you my pants and you go rummaging around in my pockets until you find my wallet, which you’ll take out and go looking through for cash.

http://www.daedtech.com/visualization-mnemonics-for-software-principles