Nice example I heard when approaching Frankfurt 3 years ago from Frankfurt Radar:
An aircraft had a stuck mike and messed up everything in the approach.
After a while they found out by themselves and said how sorry they are.
Two minutes later, stuck mike again, same aircraft.
The female controller this time ( about 1 minute stuck mike only ), with a really strict voice, came with the immediate punishment and told the crew to make 360 degree circle at the present position and then continue.
This was definetely not for traffic flow but a little lesson for them.
we had a good laugh out of this one..