I think that one saying goes Fool me once, shame on you; Fool me twice, shame on me or something like that. I've got a new line for that: Fool me thrice, head examined need I. I've been to three blogs I regularly visit, and lo and behold, I've been fooled each and every time. What a way to celebrate April Fools!
The third blog where I got fooled, Soylent Green; I don't even get the joke! The picture is here, in case you want a crack at it. Anyway, I did fool my mom early this morning, so the day hasn't drawn duds (although she did fool me later today). Have a good April Fools Day.
Update (6:20 PM EDT): I finally got it, after extra hints from cbullitt (thanks very much, cbullitt, for your continued patience). Okay, I gotta get off so I can laugh.