I was tasked with transforming 90 incoming docs per second to be pushed to clients within 7 seconds. I estimated four months to alpha.
The CEO met a poli-sci undergrad at a baseball game. The kid had written a tiny sports pool, and boasted he'd do this server in three weeks. I gladly gave him SrDev and moved to Ops.
3 weeks went by. 4 months went by, a year later he was 'ready' and it fell over in seconds. He said to me, "programming is easy, it's the debugging that is hard."