You’ll either find this incredibly funny or find it incredible that anyone could find this funny. From the HTMLDog Dogblog:
Q: Why did the XHTML actress turn down an Oscar?
A: Because she refused to be involved in the presentation.
Q: Why was the font tag an orphan?
A: Because it didn’t have a font-family.
Q: Why do CSS designers have too many children?
A: Because they employ lots of child selectors.
Q: Why was IE5’s 3-metre wide cell in the insane asylum smaller than IE6’s 3-metre wide cell?
A: Because the width of the cell included the padding…
Q: Why was the XHTML bird an invalid?
A: Because it wasn’t nested properly.
There are a few more in the comments over there. This made my day.