Last nite, super scary stuff has happen.

yesterday, my fren's birthday. by the time we came back, its 10pm++. I on the computer and start using. i use until 11++ then i went to bath. Everything is fine, nothing happen.
UNTIL...
i come back from bath, it was about 12.30am, i heard msn sound. the sound when someone message u in msn. then i look at the com, oh its grace they all. then i reply back. then i go apply lotion, face cream all this.
Come back, continue msn. Then... i realise something... my speaker isn't on! and there is a ear piece connected to the speaker. even if my speaker spoil, still can't hear. cos its not on and got ear piece.

I on the speaker, listen to it. the msn i heard just now, isn't from grace's conversation! Its from my computer. but i dunno where. I thought my com got problem. so i restart. but u know when u restart, the computer will shut down then start again rite? When it shut down, i still can hear the msn sound! My whole family is asleep. at first i thought the sound come from my sis's com, i went in, wanted to tell her lower down the volume, But when i went in, she is sleeping...

Anyway, after i restart, the msn sound just continue, it isn't like. the sound come every 5 min or 1 min. it comes in randomly. sometimes 1 times sometime 2 times, like someone really is having conversation with u. so scary!!
Then i check my window again, see is it someone is talking to me, com got problem. but.. nobody... I thought it is my illusion . cos its so late, maybe i'm too tired..

So, to confirm again, i exit my msn... STILL!
haha but then... although got this incident, i still use com use until 2am+ haha
But... so scary! After i finish using the com, i shut down.... really shut down. off the power.... and msn sound appear again....

Then i faster off the switch and went to my room and play nintendos game.
So scary!
I thought maybe it really is my illusion..
This afternoon, i told my sis about it, asking whether she got hear anything last nite, and she told me she also heard the msn sound while she is going to the toilet, she is wondering, why so loud...

This isn't my illusion after all.
So..... WHO IS MSNING ME?!!??!