A state of (madness) achieved when a (scenario) pushs the boundaries of normal (humour).
Mackerel Madness. An alternative approach to life, not
excepting the social status
quo. Unoffensive, yet inappropriate behavoir to alter generel perspective.
"That persons outfit and facial hair were
Mackerel Madness"
Busking on a local bus service and jamming with the driver and passengers could be considered Mackerel Madness.