Can 'Impossible' really be ' I am possible ' sometimes?

During a conversation :
Me - This is impossible.
The other person - Nothing is impossible.
random person who was passing by - Yes. Nothing is impossible.
If you go home and open a dictionary and check the meaning of the word ' Nothing ' , you will instantly realise that you were a fool if you some day, somewhere you told the exact same thing the other person in the conversation stated.
Impossible is itself a word which clearly defines that it's not possible and yes, there are numerous things in this world which are not possible.
Making the word 'Impossible' to ' I am possible ' doesn't make any sense. Everything is not possible.
So next time before using the phase stated above, please think twice.
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Keep smiling and spread smile.