At OAK while waiting for my UA Sh*ttle flight to LAX, I watched as a particularly obnoxious passenger berated the gate agents because our departure was delayed 45 minutes. He was truly obnoxious and I felt sorry for the gate agents as they certainly didn't have any control over the schedule. I went into the gift shop next door to the gate and bought a Ghiradelli chocolate assortment. I brought it over to the desk and told the agents that this for them and I hoped that this made their day a little better. Needless to say they were very surprised and appreciative. I didn't expect, nor received, anything in return. But interestingly enough, on my next UA trip I was operationally upgraded to F. Karma?