Things that glowed in broad daylight with no clear light source were never a good thing.
Sadly, common sense was not that common. "It's either a magical artifact, cursed, or some kind of alien technolgy... why are you poking it?"
The twins crouched near the object looked up with a dual scowl, but made no move to actually get away. "Oh, come on, it's clearly harmless."
By the laws of dramatic irony, that was the exact moment the object started to glow ominously.
Then came the glowing, swirling portal that started to suck in everything around it. "Oh, for f....!"