Some guy recently caught his best friend's wife cheating on him, and decided to confront her while RECORDING it.

It looks like she's out at a club or something, sitting at a table with her leg draped over the guy.  Then the friend walks up and calmly asks what's going on.  And she realizes she's caught, so she just says, "Yep, you KNOW [what's] going on."

Meanwhile, the guy she's with tries to hide his face by putting his phone in front of it and turning the flash on.