Now Nadab and Abihu, the sons of Aaron, took their respective firepans, and after putting fire in them, placed incense on it and offered strange fire before the LORD, which He had not commanded them.
And fire came out from the presence of the LORD and consumed them, and they died before the LORD. (Leviticus 10:1-2)
Cute story. Short. A couple of Aaron’s (the first High Priest) kids helped out with the ceremony. Only they, oops, burned the wrong incense. That’s it for them, then. BAM! Dead! Lesson, don’t use the wrong incense, Yahweh does not like sandlewood!