This. I didn't even need to learn this the hard way, just had to read back some of my earliest teenage code (obviously not for any type of "production" setting)

This. I didn't even need to learn this the hard way, just had to read back some of my earliest teenage code (obviously not for any type of "production" setting) and hear enough of these scary stories to decide once and for all, it's really not that hard or big of a deal to be professional about these kinds of things. Same goes for code comments. Unless it's a really, really good joke that won't offend if it happens to show up anywhere, or over your shoulder.