Chiste matemático

- [...] a cosine function is basically the shape of ripples in water or holding the end of a rope and shaking it up and down.
- Every time I hold the end of a rope and shake it up and down, I get something basically the shape of a sine function... What am I doing wrong?
- Start shaking the rope at eye lovel, not at navel level. Duh.

Chiste geek @ Explaining the JPEG Algorithm