"Unhappiness Day is an event that took place in \"Happy Unhappiness Day To You\". It is a yearly day of observance for the Smurfs to appreciate the good times by experiencing a whole day of sadness, usually by giving up whatever each Smurf enjoys doing that makes them happy. Gargamel used a device on this particular day to track down the Smurfs since they are normally happy throughout most of the year, but being unaware of this event, his device ended up leading him to other happy creatures that were more than displeased with the evil wizard disrupting their happiness. When the day ended, Gargamel frustratingly destroyed the device and tossed it into his muck pond when he started hearing the Smurfs being happy again, but the machine was now beyond repair and Gargamel couldn't do anything about it but curse the Smurfs for his action."@en . . . "Unhappiness Day is an event that took place in \"Happy Unhappiness Day To You\". It is a yearly day of observance for the Smurfs to appreciate the good times by experiencing a whole day of sadness, usually by giving up whatever each Smurf enjoys doing that makes them happy."@en . "Unhappiness Day"@en . .