Granny
When you do not wish your own grandmother a happy birthday, that is pretty bad. Grandmothers love their grandchildren more than anything else, perhaps even more than their own children. Make sure you are taking the time out of your life to at least remember their birthday and wish them all the best.
You never know when the day might come that they are not around anymore and you will probably deeply regret it. At least this grandmother had a great sense of humor and called out her grandson for his poor memory. See, older people can be really funny and outsmart us at every turn.