I stated I can not wait till aliens come and make there exsistance known to man, but my friend replied, how can you be so childish so foolish, we have been around for thousands of years been to the moon and looked all around our solar system with no prevail, to believe after all that you still think that there could be aliens, how dumb, so i took him over to a lake and told him i don't believe there are any fish in this lake, he said of course there is fish in this lake there is fish in all lakes, so i took a cup and filled it with water and said look there is no fish in this cup so there must not be any fish in this lake.