[Zeke]

They're "just" pie jokes. A Steep Price For Pie is a whole series -- there are seven strips so far, so if you don't like the first one, try the others. There are other subcomics, too; An Inappropriate Time For Ham and What a Scoop! are hilarious. The idea in each case, as I see it, is that he picked a title and then wrote cartoons to fit it.

As for Bob the Angry Flower, that's an acquired taste. There's basically no continuity between strips, so you're not missing any context. I can recommend a passel of individual Bob strips I love, but a better idea is to poke around the archives. (Don't just read recent strips... for the last two years or so, Bob has been almost incessantly political. I put up with it because I'm already a fan, but the political stuff won't make you one.)