Well... So far I haven't really seen a conversation between Yoda, Gollum, and Dobby. So I guess I decided to give it a go!
© copyright LahtoriReikna
Note: The italic stuff is when something is said with meaning and force to it. The bold-italic stuff is action, or movement.
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All three of them entered a room at the same time. They looked at each other. Suddenly, a conversation!
Dobby: Hello! My name is Dobby the Houself!
Gollum: rubbing the ring My preciiiouussssssssssss...
Yoda: Sense great fear in you I do.
Gollum: prrreeecciiioooouuuuuuusssssssss...
Dobby: waves hats at Gollum hello?
Smeagol: They are trying to talk to us!
Gollum: No they don't, they want the ring...
Smeagol: But smeagol wants to make friends...
Yoda: The dark side you are going. Be mindful of you feelings, you should.
Gollum: hisses
Dobby: What's this stuff about dark? Everyone knows he is the only being dark enough in the world...
Yoda: ... This Darth Vader.
Dobby: No, no! Someone else whom I shall not speak of.
Yoda: Fear leads to hate, hate leads to suffering...
Smeagol: What are they talking about?
Gollum: I told you not to listen.
Smeagol: Smeagol want to make friends!
Dobby: takes the ring from Gollum What's this?
Gollum: NOOOOO! hisses
Yoda: Full of darkness it is.
Dobby: puts it on
Gollum: shrieking My preciouuusssssssssss! jumps onto invisible Dobby
Yoda: doesn't do anythin
Gollum and Dobby: both fighting over the ring
Yoda: Excuse me you will. breaks them appart with the Force Have an appointment I do.
Dobby: still invisible Really? Where?
Gollum: finds dobby's finger and rips ring off it PRECIOUUSSSSSSSSSSSSSSSSSSSSS!
Dobby: sucks on finger That hurt.
Yoda: flips over them Leave I must.
Dobby: I'm going to! That Gollum freak is mean!
Gollum: My precioussssssss...
Yoda and Dobby both leave, Gollum stays rubbing his ring
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That's it. Sucks doesn't it? I gave it a go. I might update it to make it better, might, if I don't get too lazy...
Gollum: still rubbing ring