No and i doubt id ever say it. If i saw someone REALLY upset id probably go to gregs and buy them a muffin or come coffee or pay for their meal if i saw them in an eating place or whatever. Do something genuinely nice with no expectation on their part. See i think the annoying thing about "Smile" is youre not offering anything of value to someone who is upset, youre not helping them, youre just reminding them of an emotion they are not feeling right now but want to. Its a little pointless and all youre doing is putting ANOTHER vague expectation on them. It might ADD to the stress. I know the intent is pure and kind but theres better ways of expressing it. Do something that puts the onus on YOU to do something not them. Dont put more pressure, no matter how innocuous or small, onto an already upset person. Take something OFF their mind instead by doing something nice.