I am trained to rely on first impressions. And it works for me not only professionally but in "ordinary" life too.
And BTW to spoil your fun we do make our opinion of somebody in about 20 seconds. This is what pure science says. We compute the 4 billion bits of information we get every second and decode it through our "systems" to arrive to a conclusion - like, not like, can talk to, can't...and so on... and on... to change it we need a lot of input on the contrary.
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