Keystone Kops

Pennsylvania State Police.

Taken from both the silent comedy movies of the same name and that Pennsylvania is the Keystone State, using the keystone as one of its symbols (which is found as the dash separator on their license plates as well).
"Slow down - there's a Keystone Kop sitting up on that bridge!"

"PA has a nice state law - only the Keystone Kops can use radar. Local police can't."
by OldsVistaCruiser April 05, 2012
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Hen grenades

Eggs. (Used in context of throwing eggs at something)

From Tom & Jerry cartoon, "Yankee Doodle Mouse", which showed Jerry using eggs in a carton labeled as "Hen-Grenades", as a weapon against Tom.
They threw hen grenades at someone's house last night!
by OldsVistaCruiser January 09, 2011
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