Sweden’s Björketorp runestone (center, above) certainly means business. Thirteen feet tall, it bears this threatening inscription:

Here, I have hidden the secret of powerful runes, strong runes. The one who breaks this memorial will be eternally tormented by anger. Treacherous death will hit him. I foresee perdition.

That’s scary, but it’s not very clear. Archaeologists had thought the curse protected a grave, but a dig in 1914 found no remains. So maybe it’s a cenotaph (meaning the body is buried elsewhere), or a shrine to Odin, or an ancient border marker between Sweden and Denmark. Anyway, be vaguely careful.