Call for Me

Me, on entering the taxi:

"On call for Mark?"

Driver: "What?"

Me: "Mark?" *points at the console*

*driver stares at me intensely*

Me: "M...m... Mark? On call?"

"Where?"

"Mark? On call?!"

"Where??"

"Mark???"

"What?"

"Mark??? On call???"

"Ahh.. On call ah?" *finally*

...and away we went...