Slap them both silly.
Two of your coworkers,Francisco and Juan have been arguing for two days. What would you be most likely to do?
Call their mom, they are brothers.
Tell them to shut up so I could get my work done.
Start selling popcorn
Best is to not get involved, let them get tired and sort it out.
There's some sort of payoff for both of them or they wouldn't continue the argument.
And arguing is not necessarily a bad thing---either the argument or the payoff; but you can certainly ask them to stop or take it somewhere else if it is unreasonably disrupting things.
You tell Jaun to keep saying this: