Expect to pay bribes to police officers. It's often cheap - abut 100 naira. A request for a bribe often comes with this sentence "anything for us for the weekend". The bribe situation gets worse as you travel deeper into Nigeria and towards Benin.
Expect delays at the Seme border post (often closed because of corruption). There, requests for bribes are blatant and increase in value depending on your race and country of origin. You will be arrested several times, have a few arguments but in the end you pay the bribe to get your passport back. On the Benin side of the border things are pretty much the same - so make sure you have some CFA or naira - never flash any foreign currency like dollars - this is asking.
