Sometimes the best marketing happens unintentionally. Accidental humor can catch people's attention better than anything you'd create on purpose, because it's way more memorable and entertaining. Usually, these advertisements are so full of irony that we can't help but laugh at them (or with them…It's not always a bad thing, after all).

One of the best places to find things like this also happens to be billboards, signs and other types of printable advertising that clearly could have used some additional proofreading before they put huge versions of them beside the local highway.

When the message you're trying to share is so noticeable, it's all anyone can talk about, especially when you inadvertently send a very different message than you meant to.

The subreddit "Ironic Signs" is where many of these marketing and messaging accidents occur that wind up making the viewing experience way funnier than it would have been otherwise.

Here are 16 of our favorites.