"Policeman's lot is oft a happy one. They split up into groups and scattered, saluting, towards their beats. Let out to graze. Best moment to attack one in pudding time. A punch in his dinner." (U8.409)

From the Gilbert & Sullivan opera "Pirates of Penzance" (1879)
(William Schwenk Gilbert / Sir Arthur Sullivan)
has for refrain:

When constabulary duty's to be done, to be done
A policeman's lot is not a happy one...'