Sin(x), cos(x) and e^x all go to a party.
After an hour, sin(x) notices e^x sat alone by the bar.
Sin(x) : “Why are you sat alone?”
E^x : “Well I tried integrating but nothing happened!”
π and i walked into the bar. After a couple of drinks, their conversation became more heated. “Be rational!” exclaimed the i. “Oh, get real” replied the π.