Can't They Just Let the Bottles Go?

I'm going to have to ask you to take a close look at the three guys in this picture.

You would notice that they're all doing the same thing - taking a leak.

Have you seen their hands. Of course they're all holding the same thing and i'm wondering why they just can't let the bottles go. Why do you think they're holding the bottles and what do you think happened to the content?

While you're thinking of an answer, i just hope they're not going to be driving a car afterwards.