"The party's not over till you smile for the…

“The party’s not over till you smile for the mugshot” is a jocular line that has been printed on many gift items, such as T-shirts, ecards and posters. “The party isnt over til you smile for the mugshot” was cited on Twitter on April 2, 2010. “The party isn’t over ‘til you smile for the mug shot!” was cited on Twitter on August 20, 2010.

Twitter
Geranda McAbee
‏@GerandaSideways
The party isnt over til you smile for the mugshot
1:46 PM - 2 Apr 2010

Twitter
Jacob&Nancy
‏@SoCalQuoters
The party isn’t over ‘til you smile for the mug shot! #QAM_
3:48 PM - 30 Aug 2010

Twitter
Bigdawg
‏@BigdawgPaulShow
The Party is not over until you smile for the mugshot!
4:55 PM - 10 Jan 2011

Twitter
ROCK100DIZ.com
‏@ROCK100DIZcom
The Party is not over until you smile for the mugshot http://bit.ly/gQg60F on Rock100DIZ.com and Rhythm96.com
4:56 PM - 10 Jan 2011

reddit
The party’s not over till you smile for the mugshot! (i.imgur.com)
submitted September 2, 2012 by Werro_123Twilight Sparkle

Google Books
More One Liners, Jokes and Gags
By Grant Tucker
London: The Robson Press
2013
Pg. ?:
The party’s not over till you smile for the mugshot.

My Muse shanked me
Thursday, April 16, 2015
Drinkin’ Week - Thursday
Sometimes I just don’t know when to stop…
(...)
The party ain’t over until you smile for the mugshot.