VIDEOS:
Becoming a Lumberjack
The famous lumberjack sketch is usually established as one, the Michael Palin character (most often either a homicidal barber or the pet-shop owner from the "Dead-Parrot" Sketch) admitting that they would have preferred to be a lumberjack to their current job.
Example of:
Career Not Taken
Eulogy for Graham Chapman
Example of:
The "Fun" in "Funeral"