Do you go with the traditional handshake, a hug, fist bump, or props when you greet or bump into someone you know?

A number of factors come into play, like the formality, setting and the duration of when you last saw the person.

Monday night's matchup between the Golden State Warriors and Los Angeles Lakers brought some big name celebrities to the Staples Center.

Boxers Floyd Mayweather and Manny Pacquiao witnessed the Warriors defeat the Lakers 130-111, and the two boxers seemed a little puzzled on how they wanted to physically interact with each other.

Mayweather sat courtside, and when the former rivals came together, a camera caught one of the more awkward hand interactions you'll see.

There's a reason why we said hand "interaction," not "handshake," because that was tough to watch.

Mayweather and Pacquiao have made a fortune with their hands over the years, but getting down the proper hand interaction with one person standing and the other sitting down is something that needs to be brushed up.

But, maybe they're just playing the public and building up the hype for a potential rematch of their 2015 fight considering someone happended to be recording Pacquaio at the exact moment he walked by with the video then ending up on Pacquiao's Twitter account.

Earlier this month, the two engaged in a thumb war when they both attended a Clippers game. Maybe next time they run into each other they'll be throwing jabs instead.

(h/t Manny Pacquiao)