Why are there Lines on Solo Cups? Do You Know?

Have you ever noticed the lines on Solo Cups? Do you why they're there?

It's not just for decoration.

Wow! All this time I had no idea. I wouldn't say my mind is blown, but it certainly answered my curiosity as to why those lines are there.

And of course I couldn't do a video on Red Solo Cups, without showing Toby Keith's "Red Solo Cup". Enjoy!