Todays cartoon is so apt
http://www.comics.com/comics/arlonjanis/archive/arlonjanis-20070324.html

Doesn't  matter that I've had cats almost 40yrs, they all catch me with
this trick, stare at nothing until I look then they're busy at something
else when I look back at them.  A coupla other Ludwigs:
http://www.comics.com/comics/arlonjanis/archive/arlonjanis-20070221.html

http://www.comics.com/comics/arlonjanis/archive/arlonjanis-20070314.html