I will welcome alien with a warm smile into my house and offer him heinken.
both of us will sit in my living room and will switch on CNN channel in T.V.
i know at that time president George w. Bush's live press conference is telecasting. After 5 minutes of following that conference, Alien stopped talking and become confused and restless and open the door and jumped down from 10th floor floor and run away.
1. get a knife and stab repetedly untill dead.
2. repeat step one with all those who come to avenge
3. if an opportunity arrises get some weapons that are more practical than a knife.
if an alien comes to my door in the morning, i' will give him a warm welcome and will quickly hide him at a safe place. i 'll try to communicate with him and will try to know what he takes as nutrition . then i will fullfill his requirements .i'll ask him his purpose of visiting earth. i'll tell him about earth and will try to know about his planets .i will ask him questions untill my limit of ciriosity ends.if his purpose of visiting the earth will be ideal then i will keep him in my home or if he has been mistakenly left to the earth by his mates , then will try to resend him to his planet.on the other hand if his purpose of visiting the earth will be to harm the people of earth ,then as a citizen of earth first i will try to avoid him from harming the people of earth or inform all the diffences about it.
I'd think it was a person in a costume and that I was being secretly filmed on TV or something lol.. I'd probably be like 'erm... Hi, can I help you...?' and if it got too wierd I'd just shut the door.