Lots of cases where teams and fans have perhaps needed to be more careful about what they wished for.
Either the "top top" clubs demanding they continue to challenge and win trophies or other clubs thinking they are stagnating and should be pushing on as their manager has taken them as far as they can/clearly isn't good enough for their club.
Arsenal, bored of just qualifying for the Champions League and distraught at missing out 1 year whilst having to put up with "only" an FA Cup Winners here and there under Wenger ...
Chelsea, not content with winning the Champions League in dull style under Di-Matteo.
Man Utd discontent with Moyes
Stoke stagnating in mid-table under Pulis.
Forest, Derby and Watford all going through Lord knows how many managers.
Everton courting then regretting Silva.
So easy to be impatient or not appreciate what you have and pay the price in the end.