What have you learnt from this lesson?

I learnt that we should not judge a person by his appearance. For example, the Joker. He looks scary, with skin permanently bleached to chalk white and robs a card company. However, he had a sad past. He robs the card company in order to support his family and his face was disfigured because he jumped into the chemical plant's toxic waste catch-basin vat to excape from Batman and is swept through a pipe leading to outside the card company. When he reached outside, he realised that his face was already bleached to chalk white.