I do realise I have a lot of post about pee but when you have a hubby with a mini bladder its hard not to pay attention to things like this.
This is a website (Runpee.com) that lets you know which part of a film you can run to the loo without missing anything important! They give you both the time in minutes into the film as well as a brief description of what is going on so you know when to duck out. If the pee break they suggest falls within an point of the film that might be a spoiler they actually scramble the description so you can decide whether or not you want to know what will happen.
Now they just have to integrate this with a site like seat guru (a fantastic site that tells you which are the best seats on an airplane) that tells you which seats are closest to the loo and we would be all set!!