@_josephine0_ C because he is in pain. This is not a natural process. For the rest, thats a natural process. Age, mother with baby etc. Designed to do that.
@_josephine0_ When I was in the US, one shuttle driver had a board in his bus written as ..I WORK FOR TIPS. I never gave him a cent in 6 weeks. The other old lady who replaced her in some hours, never asked or signed for such thing. Everyone liked her. Tips shouldn't be mandatory.