what does it mean?

[victor su]

the scene is in episode 21, season five of Friends. Ross and Joey are throwing a ball to each other and would like to do it without dropping it as long as they can. But suddenly Joey has to go to the bathroom. While Ross is throwing the ball at the wall. Joey says from the bathroom: I don't think we are gonna make it. And Ross says: I know. Don't switch hands.

What does Ross mean?

Thanks!

[buggles]

the scene is in episode 21, season five of Friends. Ross and Joey are throwing a ball to each other and would like to do it without dropping it as long as they can. But suddenly Joey has to go to the bathroom. While Ross is throwing the ball at the wall. Joey says from the bathroom: I don't think we are gonna make it. And Ross says: I know. Don't switch hands.

What does Ross mean?

Thanks!

Ross doesn't want to catch a ball thrown by Joey with whichever hand he used to "go to the bathroom".
Would you!!??