Before you read this joke, I may warn you that this joke is strictly for those who are familiar with the basics of mathematics..so if you are one of those people who dig under the rocks when given a basic math problem to solve, you may wish to leave now!

The guy gets on a bus and starts threatening everybody: "I'll integrate you! I'll differentiate you!!!" So everybody gets scared and runs away. Only one person stays. The guy comes up to him and says: "Aren't you scared, I'll integrate you, I'll differentiate you!!!" And the other guy says; "No, I am not scared, I am e^x."