What stuff can be best done at work rather than at home?

So I have a question for the community… We all know the mantra of “Boss Makes a Dollar, I Make a Dime. That's why I poop on company time!”. We can then argue that pooping is something you should try to do as much as possible during working hours. The same could be said about being sad, don't do that during your free time, cry at the office instead! But what other things are there that could best be done at the office rather than at home? Note that these should be things that your boss can’t really get upset about, at least not officially. Thanks in advance!