(Dedicated to Szymon, Dan, Ula, Kinga and of course, Jimi)
Chalk is a white material which was made into sticks for teachers to write on blackboards.
If you are chalk and cheese, you are completely opposite to someone.
Although they were twins, they were like chalk and cheese.
Here is one of the most unusual combinations that I have ever come across; Jimi Hendrix and the Teletubbies.
By the way, tele is another word for TV, and tubby is a rather soft, childlike way of saying fat - that's why they are called Teletubbies!
Now, prepare for the experience of a lifetime!