You haven't seen the magic of the Nigerian "film" industry. Or 'Nollywood' as it's apparently known.
I once saw a couple of Nigerian films round an uncle's house and they were for want of a better term, demented. Shouting was pretty much the acting technique. There was no plot complete without a cheating wife and a giant tortoise. Sometimes the wife cheated with the giant tortoise. You could never really be sure.
Here are some Nigerian adverts.