Sometimes... or almost all the time... I am writing something in Second Life, and because I type slowly and there may be several people typing quickly, the thing I want to say changes while I am writing it. Others may bring up new information, answer or ask questions, or make remarks. Sometimes it goes like this:
A: Hi! How are you?
Me: Hi! I'm fine - how are you?
[Me: (typing but I don't enter because it's too late) What are you up to today?]
A: I'm building a new house - do you have any window textures? No wait, I don't need window textures I meant railing textures.
Me: I have a few. What kind are you looking for? (meaning windows)
A: Anything is good. Let me see them.
Me: I don't have any.
A: ??? I thought you said you did?

OR sometimes it's like this:

A: Where's a good place to get samovars in SL?
[me: starts typing - Does it need to be scripted?]
B: you mean objects or textures?
A: Oh, I guess I want an object.
C: What kind of scripting?
[me: starts to edit since the question was asked - Does it need to give tea to others...]
C: like serve at a click type thing, you know
me: (edits but gets sentences mixed) - Does you want to keep around a certain price?
A: Osprey, you should use the word "do" in that sentence.
me (small internal mushroom cloud) thinks "I hate you, A."

I made that particular scenario up, but unfortunately it happens all the time. I quite see why people hide up in the sky.