Geez, Pixie, you should try that at sjgames.com! Lots of 'em have multiple zombie plans, depending on whether they're classic Romero shamblers, 28 Days Later-style runners, or some other category - and they'll even discuss the categories...
Whether Mensa is fun depends on which chapter you're looking at, when you're doing it, and which events you attend. When I first joined, in the Seattle area, the chapter was mostly focused on being all serious and considering Grand World Problems - but then again, this was during the Ford Misadministration.
Later, during the Reagan era, I wound up with San Diego Mensa, and while the local gatherings could be a bit dull, the SIG meetings were interesting - especially the Pseudo-Cynics, who hosted such annual parties as the September Back-To-School Beer-and-Cheese-Tasting Party, the February Make Him Sleep On the Wet Spot party, the July Let's Rejoin the British bash, and (my favorite) the December White Elephant Party. (The point of the last was to give the worst white-elephant presents you could come up with - they were assigned randomly - and, of course, to have fun. I gave out a Christmas-light string that had been chewed in half, and received in exchange an electric blanket with no cord. They would also decorate a dead tree, with an award for the worst ornament. The last year I was there, the perennial favorite, a fake eyeball in a plastic tube, was displaced by a mummified fish with a Santa hat glued on.)
So, as you can see, the best answer to the question is, "It depends." It helps if you can get to hang out with people who aren't insecure about their intelligence - they seem to feel the least need to "prove" how "smart" they are.
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Sodium is a metal that reacts explosively when exposed to water. Chlorine is a gas that'll kill you dead in moments. Together they make my fries taste good.