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Some members of the Oracle community got well and truly into the April Fools Day spirit this year.
There were plenty of very earnest looking blog posts about a new 18c function – “TO_DOG_YEAR”. You can read their posts here
http://www.oralytics.com/2018/04/predicting-ibs-in-dogs-using-oracle-18c.html
https://blog.dbi-services.com/after-iot-iop-makes-its-way-to-the-database/
http://berxblog.blogspot.ie/2018/04/more-fun-with-ages.html
http://vanpupi.stepi.net/2018/04/01/exploring-18c-exadata-functions/
They even enlisted the help of the team here at AskTOM where they posed a question looking for more details here.
But naturally, it was important to get as many puns and hints into our answer as possible – did you spot them all ? 
Learning is not a spectator sport 