This was the question:
Does this sentence make you chuckle? "Covered in a thick layer of dust, Martin was certain that the tray hadn't been touched in years."
Yes. That's a hilarious misplaced modifier.
No. The sentence looks all right to me.
No. I see it's a misplaced modifier, but so what?
Of course I thought it was hilarious. Martin is not covered in dust; the tray is.