Of course, what you’re writing doesn’t need to be on task. Write a grocery list or the next great novel.
Keep an eye out. If someone is coming by, turn to a page with text instead.
If you do play on your computer, though, make sure that your company doesn’t take screenshots, which could get you fired if you’re not working when you should be. Similarly, if you’re at school, you can get in trouble for not being on task. Also, make sure no one can walk up behind you and see what you’re doing. It helps to have a work document open that you can easily flip to.
You can also do things like shuffle shirts around in a store.
For instance, these sites will have games that look like a spreadsheet. That way, you can goof off, and if anyone looks at the screen, it just looks like you’re working on a spreadsheet.