When you walk into a department store and the assistant says “you alright?”. So I answer sweetly, yes thank you. Then another one appears. “You alright?” I answer a little less sweetly, yes thank you. A third appears. “You alright?”. This time I reply - no I’m not, I’ve got a bloody headache, I’ve just had a row with my daughter/friend/colleague and now I can’t be left in peace by overmade up women with caterpillar eyebrows who won’t leave me alone and instead of asking politely if they can help ask if I’m alright! Of course this is all said in my head. 
But what the hell happened to can I help you??