You can't go anywhere on the Internet these days without seeing them. Most are not very good, but a few are funny, so I have started publishing what I consider to be the better ones once a week. Here is No. 7.
If you'd like more, here is the "Geek-themed Meme of the Week Archive":
And if you'd like me to consider one that you've found - or created - please feel free to send it to me at email@example.com.