what are some cool things you can do with PHP?

Question

like some advanced type things

Answer 1

Program a turn-based game like artillery / scorched earth.

Program a MMOG

Answer 2

Well I had a bell go off on my home computer every time someone visited a remote website.
That started to irritate though.

Now LED's light up on my desk according to numbers people type into a form.

Then there was an 12 inch long 8 legged walking plastic toy, that walked that people could control from the internet and watch over a webcam.

Cool, probably not. And I got bored pretty quick with them.

But they were incredibly pointless.
And that's always a plus.