May I or Can I?

Have you ever thought about what you should say, May I or Can I? 
Most people use Can I in a question all the time, but it is more polite to ask a question with May I. However, if you decide to be very informal, you may find someone who will give you a weird answer. Watch the following passage of the movie Avalon (1990); have fun and learn the difference. 
/www.youtube.com/watch?v=tj_c2UfMSks




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