Science, come to my aid!
So.. I buy a 6pack of 24oz plastic bottle pepsi. My sister takes one and goes into another room. few minutes later she's yelling saying the bottle exploded all over her after she already opened it and took a few drinks out of it, while she was trying to close it.
She's pretty ditzy, so I just thought she did something stupid.
Later, I open one of the bottles. take a few drinks out of it, and go to close the lid. As soon as the lid goes on, it fizzes up real fasts and leaks all over.
wut?
nothing was put inside it, or fell inside. wasnt eating anything at the time, but minutes before I did have a tuna sandwich.
going to open another bottle!
XI Wiki



