Above, a 1934 plaque from the Big Apple Night Club at West 135th Street and Seventh Avenue in Harlem. Discarded as trash in 2006. Now a Popeye's fast food restaurant on Google Maps.

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Entry from April 09, 2020
“Good morning, inmates” (2019–20 coronavirus pandemic quarantine)

The 2019–20 coronavirus pandemic locked people in their homes, as if they were in jail.

“Good morning inmates” was posted on Twitter by The real me on February 26, 2020. “Good morning inmates!!! #HighRiskCovid19 #IndieDevWorldOrder #indiegames #madewithunity #Dust3D” was posted on Twitter by DeSink on March 15, 2020. “Good Morning inmates!  Hope you’re enjoying your solitary confinement” was posted on Twitter by Michael Patrick on March 22, 2020.

“Good morning inmates” has been printed on several images.

“Good morning, self-isolation inmates! Anyone know how much vodka goes in scrambled eggs?” is an extension of the saying.

Wikipedia: 2019-20 coronavirus outbreak
The 2019–20 coronavirus pandemic is an ongoing global pandemic of coronavirus disease 2019 (COVID-19), caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The outbreak was first identified in Wuhan, Hubei, China, in December 2019, and was recognised as a pandemic by the World Health Organization (WHO) on 11 March 2020.

The real me
Good morning inmates
☕☕☕☕
Have a fab day!
2:41 AM · Feb 26, 2020·Twitter for Android

DeSink
@DeSinkStudios
Good morning inmates!!!
11:13 AM · Mar 15, 2020·Twitter for iPhone

Michael Patrick
@M1cha31Patr1ck
Good Morning inmates!  Hope you’re enjoying your solitary confinement.  It’s time for our morning #MATH exercises.  Question: why does the curve on these #CoronavirusPandemic charts look exactly the same everyday?
7:01 AM · Mar 22, 2020·Twitter for Android

Mthimkhulu
@Ntsimbisays
Good morning inmates #21daysLockdownSA
4:19 AM · Mar 27, 2020·Twitter for Android

Bonang B* Matheba
@bonang_m
....good morning inmates.
3:12 AM · Mar 30, 2020·Twitter for Android

nty tony
@bourtnoaaa
Since under quarantine, my brother has been saying “good morning inmates” to start his day
4:18 PM · Apr 8, 2020·Twitter for iPhone