We do that but also:

• decide we cant afford 20k for a waterfall car
• buy an off the shelf skateboard, that has a 10k per year oracle subscription
• saw it in two
• glue on a broom handle so it at least looks like the scooter in agile step 2.
• mark the project as done.

Then spend 15k fudging the ‘benefits realisation’ to make it look like a the users were really happy with car that only had two wheels and no engine.