That ugly thing sticking out of an engine is part of the turbine. Airplanes aren't quite like cars -- where if the engine fails, you're still on the ground and coast to a stop. Jet engines, when they fail, can and often do shed scrap flying in all directions -- like a bomb going off. High speed metal scrap. Scrap that can slice through the cabin like it wasn't even there. Scrap that can take your head clean off, as in D.E.A.D.
So when the airline says a flight is going to be delayed because the palne has a problem, think back to this picture and thank them for saving your life, not rant at them for ruining your holiday or wedding.