Shopping together. Go through one of those annoying self service tills. Its not working right, he is waiting. You are trying to get it to work alongside your crying child. You are waiting for assistance. Suddenly he snatches the bag with a few bits of shopping off you and says very loudly (so everyone can hear) "FFS! sort it out, take it off there and start again! Fucking hell!" and then throws the bag at you so you are fumbling to catch it.
You get outside and ask that he not to speak to you like that and he calls you "a touchy fucker" and says he is not going to fucking apologise to you because he didn't do anything wrong and you expect too much, he is sick of apologising to you.
This is not an unusual occurence btw. Not always at Asda self service tills obviously but quite often though usually at home not in public.