Why won't people believe it is dangerous to be in the water (pond, lake, ocean) when they hear that first rumble of thunder or flash of lightning?
The thunder is a warning lightning may be on the way.
We have had three deaths from lighning in the last 10 years right here on the NH seacoast. Two surfers and another person ... all of whom ignored the thunder and were struck and killed by lightning.
So, pay attention. Summer will come this year (I promise).