What is Aspergers Syndrome?

My friend dressed up as a clown to surprised his cousin. Now I must say my friends cousin he is my same age 18 he saw my friend dress up as a clown He scream got starded yelling get away you creep. My friends cousin mom came right away We felt bad we didn't mean to scare him. The dudes mom says that we didn't know and it's not our fault. Her son has Asperger. Syndrome I didn't want to sit there and ask questions since it is rude and we already had done enough so I come here to ask.
What is Aspergers Syndrome?
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