Comedy Act

About 6 months ago I got myself a work husband. I have had one of these before, but this relationship is more like a comedy act, according to the world of our colleagues.

He will start a sentence and I will finish it, like;

Work husband, "He's going to Brixton academy, in... [pause]"
Me, "Brixton"

What's funny about that?

Is it funny when I have to remind my work husband, from South Africa, that the big continent south of Europe is called Africa?

Maybe.