Board Thread:General Discussion/@comment-26006155-20190617222636/@comment-26006155-20190702114814

Why did The Darkest Experiment have to be something evil, rather than something mundane like a lightbulb burning out?

Because it led to Sans having to kill his best friend in order to stop it.

When Gaster asked what the other two members of the Font Brigade thought of the experiment... Sans disagreed. Violently.

Which is why he felt the need to travel to the past with Papyrus, packing blasters with Gaster’s name on them.

Blasters that we find no trace of in Alphys’ lab, because when Sans traveled back in time, whatever he did resulted in Gaster’s early death in the altered Beta timeline. And Beta Gaster never had time to make them.

And this is why Sans’ soul bears the curse of darkness, even to this day.

To save the monster world, he had to kill Gaster.

So, we have two choices.

An epic story of love, loss, betrayal, horrors beyond imagining. And possibly redemption at the end.

... or someone farted and shorted out a light bulb.

If you claim the lightbulb is the more likely scenario, I fear I must disagree.