Q. What's pink and fluffy
A. Pink fluff
Q. What's blue and fluffy
A. Pink fluff holding it's breath
Fluff is loose fibres which collect on your pullover, pants, sofa, etc. Fluffy is an adjective used to describe a soft piece of clothing, or a soft animal. (a fluffy pullover, a fluffy rabbit)
In English, we say that people turn blue if they hold their breath too long.
Now do you get this silly joke??