Slide deployment
Lets get all the willy waving out the way and answer the question the op asked. On all airbus a/c and all but the 737/727 era aircraft if you open an armed door from outside it will automatically disarm and you will not swallow a slide. Notice I said 737/737 era aircraft, there will be others of a similar age like the BAC1-11 and DC8 that are the same as the 737. So if you go and meet a relic on arrival, be carefull and let the crew open the door. Most airlines of my day had the crew opening the door(s) from the inside but I did notice that some US airlines only disarmed the forward doors on a multileg flight which, in my view, is asking for trouble towards the end of a tiring day.