Double victory! I was merrily processioning along as manager of Verona, in a two-horse race for the Serie B title with Catania, when in November 2015 Norwich offer me the job of hauling them out of the relegation zone. Despite being predicted to finish 13th, they were bottom of the table without a single win from 12 games. Thanks entirely, IMO, to Roberto Martinez and a ludicrous 5-1-2-1-1 formation, the most unfathomable tactics I've ever seen from an AI. If you have a side with a quality centre-back partnership (Bassong and Ryan Bennett), good wingers (Tom Ince and Elliot Bennett), and full backs that are emphatically full backs and not wing backs (Lee Wallace and Billy Jones), why would you go with a flat back 5 and no wingers?
Anyway, I changed to a classic 4-2-3-1, and despite a couple of blips we secured 40 points and safety with two games to go - thankfully, given those two games were Arsenal and Man U away. (Though it was a pretty dire relegation battle - 35 points would have been enough and 5 sides got less than 40. Four up four down - you know it makes sense.)
Meanwhile, Frank de Boer lead my Verona side to the Serie B title, pipping Catania in the very last game by coming back to draw 1-1, while Catania lost to AlbinoLeffe. Very satisfying.