Your speech should have a main point or message and hopefully include a mix of humor with a serious morals or lesson learned. in other words there should be a point to the speech instead of a life lesson you have learned in other words there should be a point to the speech instead series of one-liners strung together, one after another. You might include a light hearted story.
topic may include
Wedding toast (best man or maid/matron of honor speech
Birthday speech
Farewell Speech
Graduation speech
Funeral speech
Commemorative speech