The immigrations official tried to extort me, naturally. After I handed him my passport, he tossed it back and said "put something in it" before he would stamp it. I continually refused and he eventually just stamped it and let me go.
Good on you!! Over the years I have often come across crap like this. Sometimes you feel sorry for the "Official" since they may not have been paid for a while - thinking Zimbabwe here - but in other cases, it is more of taking a chance to extort some $$$ from a "rich" foreigner.
But, another great TR from you, thank you for showing another side of Nigeria - my ex colleagues and I only know the Business side of things and never get a chance to see what real life is about.