What is this weird cactus like plant...?

So in this photo...
http://www.compass.org/images/garden_tom...
The cactus like plant that is in the top right side... What is it?
I think I know less about botany than a squirrel would know of quantum physics...
Update: I'm asking because I have a similar plant at my house. It looks just like that one, but it has lots of "pokes" around the edges of the leaves. Its really quite a hideous plant... I WANT TO KILL IT!!! DIE PLANT!!! Unfortunately it's my dads plant...
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