There are the 'bobbing' buses which have problem with the 'kneeling' suspension - these routinely bob up and down whilst waiting at the lights or at bus stops.
There are the 'bunny hoppers' where the ABS kicks in on every gear changes and jerks the bus forward resulting in travel sickness.
The 'smokers' which catch fire - that was a fun job interview.
The 'lates' - well, you never see those.
And the 'deads'
They're not as rare as they could be either..........