Wow, these stories put mine to shame but mine has a different spin. The one I remember the most is not the ill mannered speaking parents in a line etc but one that involved my son.
This was a few years ago when DS was 5. He has asthma, autism and several sensory issues. While we are much better with that gag reflex with smells and foods today, then he was not. It was one of those trial and error things as he was just beginning to eat more table foods and wanting to explore. We still do not know 110% what set this off.
We went through a mass of people when he started his gagging he does. Smells even used to set him off and you have a minute or less to get him out of the way if he pukes. Well I saw him getting worked up and tried my normal lets leave the area and calm down routine.
My DH was in front of me with my other DS in a stroller and I had my then 5 yr old. He was saying excuse me, we need to get through, please, thank you etc as I was hauling my crying soon to be sick son. We were headed away from the crowd but still going through ppl. We encountered this man who let DH by and comically stomped in front of me. Dh called back, I am holding DS's mouth and trying to get through. I spoke to him I was with my DH and my child was about to be sick. Before I could get it all out he was ranting - you have to say excuse me yada yada - yes I know I should have but this all happened too fast and I did not have enough wits to react in time to this stammering demanding person, focus on where DH is headed and directing him to the bathroom and keep DS in my arms totally calm. Before I could answer and do my own excuse me, never mind I am holding my hand over DS mouth and explaining he is going to be sick - DS did it... all over my hand, arm and the mans shorts and shoes.
Needless to say as I finally got through I heard some not so nice words mixed with laughing behind me. It all happened just so fast but to this day I can see the end result over and over in my head.