Terminal has gone weird after screen sharing

I used screen sharing on my Macbook Pro to remote control my friend's iMac.

Unfortunately, now my Terminal now says:

kellys-iphone-2:~ James$ 

Why is it now saying this all of a sudden? Where has kellys-iphone-2 come from? Should I be worried?

Thanks.

The default prompt in Mac OS X is derived from System Preferences -> Sharing -> Computer Name. If that is set correctly and you still see kellys-iphone in new terminal prompts, your terminal environment variable PS1 has been set in either .bashrc, .bash_profile or some other local file.

You can check which files set PS1 like so: grep PS1 ~/.*

Side note: If you see a line like this:

[ -z "$PS1" ] && return  

which just means "if this is not an interactive shell, disregard the rest of this file" - so that's not the droids you're looking for.

That should reveal a file that has a line akin to this:

export PS1="\u@\h\w$ "

Or, if I'm right:

export PS1="kellys-iphone-2:\w "

Edit that file/line to reflect what you really want. More info about custom prompts in OS X