Maybe Backup Your Data First
Before you do an fdisk on your hard drive, understand that this is not necessarily what Reformat Some Data Day is all about.
Reformatting doesn't have to involve a computer at all - though it could.
For example, you could celebrate today by changing some text from normal style to some text in italics. You could change some text to bold. Those are probably the two easiest ways to enjoy the day.
If you want to literally be bold, you could change whole paragraphs from he normal left justification to another arrangement.
You could make a paragraph right justified, but that tends to make it look really strange if it's the only one like it in the whole document.
Centering text is possible.
As is making it fully justified on both the left and the right margins, though that kind of change is only noticeable if you have enough lines of text in your paragraph in the first place. If you don't, readers probably won't even notice and your attempt at reformatting comes off as rather lame - as if these last few sentences weren't a lame attempt at making a paragraph long enough to fully justify (their existence).
Changing color and changing font size are acceptable as well.
Aren't computers wonderful? Just try doing any of the above in a handwritten letter to your mother.