Apparently, they're all pictures of Linus partying. Remember: Drinking and kernel development don't mix. Kids, don't try this at home.

Finally, kernel version 1.0 is released, and Linus breathes a sigh
of relief.

In celebration, he quickly downs a beer and decides to get back
to work.

The next morning, however, the effects of the previous night's
revelry take their toll.