It have been some time since I posted anything funny so here goes:
Q. Why do mathematicians like national parks?
A. Because of the natural logs.
Person 1: What's the integral of 1/cabin?
Person 2: A natural log cabin.
Person 1: No, a houseboat – you forgot to add the c!
The indefinite integral of 1/cabin is "ln(cabin) + c", or "A natural log cabin plus the sea", ie. "A houseboat".
A mathematician and his best friend, an engineer, attend a public lecture on geometry in thirteen-dimensional space. "How did you like it?" the mathematician wants to know after the talk. "My head's spinning," the engineer confesses. "How can you develop any intuition for thirteen-dimensional space?" "Well, it's not even difficult. All I do is visualize the situation in n-dimensional space and then set n = 13."
Found at Wikipedia