Ok, so the perfect background "I have loads to get done but wanna have something on" film needs to tick several boxes.
First of all, I need to have seen it before, or it'll be too distracting as I'll (if it's any good) want to know what happens next. - Check.
It needs to be something I can take my eyes off, so a comedy with witty dialogue is usually a good bet. - Check.
For the same reason, it doesn't want to have anyone in it that I have trouble looking away from. - Ben Stiller? - Check.
So this ticked all the boxes today, and I actually managed to get some stuff done, while also catching the good bits because I knew they were coming. I have to admit, Stiller usually irritates me, and he's not much better in this, but with such a great supporting cast, it wasn't much of a problem.