Every Friends Joke

Ross has refused to help Monica prepare food for the wedding of his former wife and her partner's wedding. But Monica is running late and pressures Ross and gets him to join everyboby in the kitchen. Monica: All right, ball a melon! Chandler: How come I'm stuck dicing when he gets to ball a melon? After what sure enough audience laughs. Saying his line Chandler pauses and stresses the "melon" word out. Ross gives him a look of "what? why do you need to put it this way" sort. What was chndler inplying? Help.

It is acouple days before Christmas. Ross and Monica just got back home with goodie bags for the party. They are both surprised that Joey and Chandler are home.  Ross: Aren't you guys supposed to be shopping? Monica: You didn't buy presents yet? Tomorrow's Christmas Eve! What are you gonna do? Chandler: Don't you have to be Claymation to say that? And this is where the mysterious laughter of audience comes again! And it is marked as the best joke of the episode in some blogs. I'd like to know what am I missing here. Help

Ross made out with Rachel last night. Later he came back home and saw a saline solution of his current girlfriend Julie on a table. That puts him off. He is lost and shares with the guys: Ross:  Here I am with Julie, this incredible, great woman who I care about and who cares about me and I'm just throwing all that away? Joey:  You got all that from saline solution? Chandler:  I'm the same way. Show me a bottle of wine. And I'm like, Wow, who am I? Chandler here isn't saying "a bottle of wine". Subtitles are wrong. He is saying something like "a bottle of Vizine". It is most probably some kind of specific to USA product, maybe medical, we don't know about. So I am firstly curious how to spell it and what is this product? And secondly why audience laughs when Chandler refers to it?