It can happen to the best?
I remember watching CNN (trying to sleep after night duty) when Bill Clinton was returning to Washington on Airforce One with big reception comittee.
Aircraft stops exactly in line with steps, red carpet in place.
Door 1L starts to open then stops for a second then continues to open followed by inflating slide.
CNN cut to something else for a few minutes and then return to see President coming down steps. Inflated slide is on the ground under the aircraft.
Nothing said!!