I tried to print a very thin sheet of paper (think magazine page) with my OKI c5400n, and it gave a paper jam error.
Now the page didn't turn up and I'm afraid it might bite me later.
I pulled out all user-servicable parts (4 color units, fuser unit, transport belt) but couldn't find it anywhere. I also opened the front feed and rear stacker, to no avail.
Where else could that sheet have ended up?