That was one determined bit of dust!
That said I can still beat it - had an earwig in my camera once! That really makes you pause and think first - what the heck is this this crawling over the viewfinder image - and then How the heck did that get in there - followed by turning the camera upside down and hoping it falls out!
I'm not even sure it fell out - it could still be in there somewhere! (although pretty dead by now I would expect)
