An Igbo doctor can't find a job so he opens a clinic and puts a sign post outside 'GET TREATMENT FOR 20k – IF NOT CURED GET BACK 100k.

A lawyer thinks this is a great opportunity to earn 100k and
goes to the clinic...

Lawyer: "I have lost my sense of taste"
Igbo man: "Nurse, bring medicine from box no. 22 and put 3 drops in patient's mouth"
Lawyer: "Ugh..this is kerosene"
Igbo man: "Congrats, your sense of taste is restored. Give me 20k"
The annoyed lawyer goes back after a few days to recover his money...
Lawyer: "I have lost my memory. I cannot remember anything"
Igbo man: "Nurse, bring medicine from box no. 22 and put 3 drops in his mouth"
Lawyer (annoyed): "This is kerosene. You gave this to me last time for restoring
my taste"
Igbo man: "Congrats. You got your memory back. Give me 20k"
The fuming lawyer pays him, and then comes back a week later determined to get back 100k.
Lawyer: "My eyesight has become very weak"
Igbo man: "Well, I don't have any medicine for
that, so take this 100k"
Lawyer (staring at the cash): "But this is 20k, not 100k".
Igbo man: "Congrats, your eyesight is restored. Give me 20k"
You can't beat an Igbo Man in business.

SOURCE: https://www.efogator.com/2019/08/igbo-man-and-lawyer.html

very funny