Is this normal?

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OK...this is going to sound very weird:).I have a good fried of mine and he has never done anything like this before, He just comes to me and asks me to try his so called "six-pack"! Help me i don't know what to do! Iv been trying to avoid him but it doesn't work. He just keeps on following me and asking me to try the "six-pack". does anyone know what i should do To make him stop? Iv tried to ask him to stop but...NO...He is weird isn't he?