A coworker says to me: "I am trying to send a Powerpoint document and it's too big. Any ideas on how to resize it?"
We take a look at it. It is just over 5 mb. So we remove one picture and put in a downsampled one. And it is just over 5 mb. So we check the size of the other picture. It's 2.75 mb. Somewhere, Powerpoint has found an extra 2.25 mb.
So we remove the other picture. And resave. Voila! It is now 108 kb. So we put in the offending picture, and somehow it is now 3 mb and won't bounce.
The question, of course, is where that phantom 2.25 mb came from?