Little Timmy learns something

One day little timmys dad asks him what he learnt in school that day. Little Timmy says: "Well, my teacher was mad as hell at me today." His dad asks:"Why was that?" "Well," says Little Timmy "she showed us two glasses filled with water and whiskey and then she put two worms in them. The worm in the whiskey died. She asked me what I learnt and I said "Whiskey sure is great way to kill the worms in your body."