What Is A Good Illustration/Quote For Speech on Resentment?

Not a particularly clever one, but very effective:

Friend and I went to hear a speaker who told us two brothers had not spoken for years, and their respective families were estranged, because one of them had once called the other a pumpkinhead.

The packed room broke up laughing. That talk was more than 20 years ago, and my friend and I have used "pumpkinhead" as a term of endearment for each other ever since.

Haha, that seems like it would actually be a nice touch if I had a bit more time. I'm not sure how I would include that in my speech but it surely would get a good response from the audience. Thanks.

Here's a couple of nice quotes I've collected over the years on resentment and forgiveness. I have a moleskine notebook in which I write down my favorite quotes and sayings:

Not forgiving someone is like drinking poison and expecting the other person to die.
- Unknown

Forgiveness is the fragrance the violet sheds on the heel that has crushed it.
- Mark Twain

For every minute you remain angry, you give up sixty seconds of peace of mind.
- Ralph Waldo Emerson