Coding personality
An observation from work today: you can figure out who wrote a function by looking at the name.
I work in a small team - of four programmers. One of us has pretty much sole responsibility for about 1/4 of the code, and the other three (including me) share the rest.
If a function name looks_like_this, with underscores and no capital letters, I wrote it. If it has InitialCaps, it's by another guy. The third guy uses camelCaps.
This is typically considered to be terribly sloppy coding, and it is a bit embarrassing sometimes. However, it has been very useful recently, as it lets us quickly figure out who we need to hassle when something goes wrong. Heh.