Ok so maybe we don't have a lot to laugh about in these situations at times but check out the smilies/emoticons - there are loads of them (click on the grey smilie face at the top of the message box). There's a search box at the top of the smiley window so you can find a particular category - as there are a lot to scroll through.
I kind of like this one
And this one - if you want to put a rocket up somebody (eg the ex) 
I kind of like this one
And this one - if you want to put a rocket up somebody (eg the ex) 
