You had a good relationship with Ketza, your biology teacher, whom you always considered a good friend, since he was very young and got along well with most of the students, especially with you.

One morning, you were in his office, just chatting and keeping him company while he finished grading some exams, since you were bored.

"The human being has 79 organs inside him..." Ketza said in a sly tone, resting his elbows on the table and staring straight into your eyes. "Would you like to go to my house and have 80?"