user: What are the different types of stances in tennis?

assistant: There are four main stances in tennis. These are; open, semi-open, closed and neutral. While open stance is the most common stance, closed stance is least common one.

user: What are some fun, safe ways to break a social norm without breaking a law?

assistant: Some fun and safe ways to break a social norm without breaking the law could include the following ideas:
- Wear winter clothes on a hot day or wear a bathing suit on a cold day
- Talk to strangers on the elevator 
- Pick your nose while talking to someone
- Lick the plate at a restaurant
- Talk to someone in another stall in a public bathroom

user: Who is the best all-time soccer player?

assistant: It is hard to say and very subjective among fans of different clubs and nationalities. But, it would be safe to say that the best all-time soccer player is among the following list: Messi, Cristiano Ronaldo, Maradona, and Pele.