A short English joke

Ultrashort English jokes 1:

Dentist: Please stop howling. I haven't touched your tooth yet.

Patient: I know, but you are stepping on my foot!

Ultra-short English joke 2:

Teacher: Why do we sometimes call the Middle Ages the Dark Ages?

Betty: Because they have many knights.

Ultra-short English joke 3:

While walking in the park, a couple noticed a young man and woman sitting on a bench and kissing passionately.

"Why don't you do this?" The wife said.

"Honey," her husband replied, "I don't even know that woman!"

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