Hahaha - speaking of forcing on guests, whenever my wife and I have company we make them play this: http://www.jxp.ca/media/fondsdecran/8/ddr-extreme-800.jpg

or if it's nice outside we play: http://www.getkoob.com/

Set! It's basically visual sudoku. In college, the Math and Computer Science department had wicked set-offs. My junior year, some friends and I wrote a java version of Set, but it only worked on Windows (because of some java/windows graphic library gotcha I never understood).

You do get better with practice.

Not only do you get better with time, any absolute imbecile can eventually become quite good at this game. Also if you teach it to a four year old by the time they're eight they can spot any set in seconds. It's freaky.

I met the creators at toy fair a few years back very nice but admitted they had nothing like it up their sleeves as a follow up.