I thought this serial number was interesting.

Sub devoted to Cool Serial Numbers on US and World Banknotes. We are your home for broken ladders, almost fancy serial numbers and other cool numbers on the paper money we all work with every day! Star notes? Bring them on! Replacement notes are cool. Do these notes have numismatic value due to their cool numbers? Probably not - but we love them anyways! Please read the pinned post before submitting your notes!