A couple of recent entries over at "Futility Closet" that I found entertaining...
First, a sort of prime-number magic square of sorts:
Who figures this stuff out... and are they still sane by the time they finish!??? ;-))
...actually, the person who concocted this square has a homepage here:
And then there's this deceptively-simple li'l story problem where all is not quite as it seems: