Funny things are happening because of a bug in Google talk.
( ref. to Google talk version : 188.8.131.52 )
To see that funny thing do this:
Logout of google talk.
Close the Google talk by clicking the X (close) button on the top right corner.
Now it should run in the background.
Now right click on the Google talk icon in the right bottom of the desktop.
It will show a menu which is perfectly fine !!!
Now turn the 'CAP LOCK' on.
Press the escape key.
Now do the same thing again (right click on the google talk icon in the right bottom of the desktop)
You will see a funny message popping up on the desktop from nowhere!!!
Hope the guys at Google take a note of this !!!!