I provide gum at my desk for my fellow coworkers. This is purely a selfish act, to make sure the people I talk to have fresh breath. The cost is minimal. Some kind soul place a fair amount of money on my desk to offset the gum cost.
My father recently passed away and upon my return to work I had made plans with co-worker A to go have lunch together. A different co-worker that sits close by over heard that I was going to lunch with co-worker A and gave them money to pay for my lunch. It truly was kind and made me feel that people truly care about others when they are going through a difficult time.