.....what you think you can do to defeat him ? ^_^

By me, i would first call the police, then i will arm myself with a long sharp Katana and wait behind a door.....

After he passes, i would just try to stun him on the back and if this fails, i would make some impressive moves to him and try to force him on escape.

If this fails too, i would rip him off.

And if you fall in a situation like this? What kind of trap can you imagine? ^_^

First, I'd try to see if he looks dangerous. If so, then I'd let him do whatever he pleases until he takes a look at my computer or piano or synthesizer (or my girlfriend, if I had one ).
That case, I'd beacome sooooo mad, I wouldn't be able to think wisely and I would kamikaze!!!!!! Until one of us falls.
Maybe I'd use this sword standing proudly on my wall...

And if it turned out to be an alien. I'd try to make a firend of him.

ooo interesting question.......if me....i'd do the same as phl lol.......well not all c whether he's dangerous or not and if he is he better be prepared to be killed!!.....this is a defense measure lol so i dun care where or how i hit or stab him as long as i'm safe [including my family] ^^] but let's not hope something like THAT would ever happen no? hmm.....better prepare a weapon under my bed.........a knife??.......hmm......maybe a stell bat