Hahah! How stupid. Looks like something that a good number of my co-workers may have done when we were teens. And -criminal charges-??? Oh mercy, they need to just relax. There are no "victims", no crime and nothing will come of anything. And if there was no Internet capable of quick movies, no one would have ever known of the prank.
If you actually read the website where the video originated from, it was the kids birthday and the prank was a dare. The kids that worked there would do dare pranks on their birthdays. So what...
Last time I checked, food for human consumption is not prepared in a dish sink, and eateries have separate sinks for dishes than what is used like to rinse lettuce. And even if I had known the brainiac had been in the sink, I would still eat there. Doesn't bother me what he did....
We have two Burger Kings here and they vary considerably. One is in an older part of town and the two times I tried it, the bread was not fresh. It's actually one inside a gas station. Plus it looks old and dirty. Even the people that work there look grungy. So, they won't get a third visit from me. The other one is brand new, just opened two months ago. Each time we have gone there, my favorite, a bacon cheese whopper with onion rings, has never ceased to be totally excellent, with fresh bread.
I'm a meat eater and now and then I need a thumping dripping burger. If I'm too lazy to make it myself, you can find me at Burger King, or seeking out the second option, a 100% sirloin bacon cheeseburger at Jack in the Box. Those are great.

(about twice a month that is) ......
I miss being a teenager when we could screw around at work without ending up on Youtube, and when I could eat two whoppers in a row to go with my Pizza! Invincible! hehehe