You walk up to a shop till or a bar, and the employee behind it says, "Can I help?"
So far, I (barely) have resisted the urge to ask, "Can you help what? Ending world hunger? Halting global warming? Picking up the rubbish in the neighborhood? Driving me from the shop?"
If someone can't be bothered to add the single-syllable word 'you' at the end of that question, I feel less than confident that they are all that interested in 'helping.'