Viral Receipt: No Tip from Single Mom?

"While scanning parenting blogs and sites yesterday, I came across an article on Huffington Post about a restaurant receipt with a note from a "single mom." I was initially a little amused that this was making the rounds because it seems so silly. Who really cares if someone, single mom or not, left a tip? It's rude in the extreme, but hardly worthy of public discussion. The more I thought abou ...