I answered my work phone with “Morgans Morgue; you kill’em, we chill’em” once. My coworker did not expect that and cracked up.
I’ve used the same line with different slogan a few times, but that’s the one that worked the best.
Mortuary Grill: where yesterday’s grief is today’s beef! Who can I serve you today?
“Catholic freight depot random city” makes callers pause for a second to think about what they just heard.
“Ahoy 'hoy” like Mr. Burns in the Simpsons?
“[your city] Police, how can I help you.”
喂你好!(or any language the caller probably doesn’t understand!)