waterfall:

• you want to go to mars
• plan to build a rocket
• sign contracts with vendors for every tiny part
• shit we didn’t need most of those parts but it’s too late
• continue to follow the plan anyway
• you now have a rocket but it doesn’t really work properly because parts needed shims to work together because the brochure didn’t mention that and the people making the plans weren’t actually building anything and also you actually wanted to drive to the beach