For me it's Loom.

I record 30+ videos a week for outreach and product walkthroughs. They charge me $15. If they bumped it to $80 I'd still pay tomorrow.

For me it was a "texture/swatch" ad style in MotionFy.

Looked great in tests, then I realized the AI couldn't actually see the product texture, it was hallucinating from the packaging. Killed it three days before launch prep.