Lithium, sodium, and potassium are all dangerous around water. All three can burn in water. Even though I'm a retired industrial chemist, it's been a long time (high school) since I dealt with these elements, but best I remember, potassium is actually explosive in water. So don't eat too many bananas and then drink water or you could develop a bad case of heartburn and also pass a lot of gas. Just kidding about the bananas.
