Collecting fancy serial numbers can be fun. One niche of this interesting hobby is to collect birthday notes. That is serial numbers that are a birthday. Generally people collect the following formats MMDDYYYY, or European style DDMMYYYY, or even YYYYMMDD or YYYYDDMM. Others even try to stretch this idea with examples like 01955113 (XYYYYMDD) or (XYYYYMMD). I still think the first two that I listed are the only real true ones.
There is even a subreddit called ''birthday notes''
Find your birthday on money.
https://www.reddit.com/r/BirthdayNotes/
The guy who runs the exchange has you send him a note when they find your note. That way it is free of charge. You can also look on Ebay and have a saved search that will allow you to be notified if your serial number shows up.
Have fun collecting.