Me: "So, to recap.. I'll be creating an integration between your site and [some software]. It will require [list of todos and features].. I expect this to take 4 hours over the next 2 business days."

Client: "But [referring company] said this would only take like 15 minutes.."

Microsoft Outlook. I've never even had to use it- I just don't like it.

Trying to add features to 15 year-old legacy code..

When your boss asks you to make a payroll system from scratch with every feature imaginable.