Tell horror stories about BCs from hell here.
1. I once took a NAC MB0405 on 265 years ago, the bus was quite
crowded and when I put transit-link card into machine, it hanged! I
waited for 10s, BC yelled into my ear to get moving, I pointed out
that my card was stuck. And waited for card to come out, BC yelled
again.
2. 648H BC on 89 kee xiao, tried to emulate pick-up speed of CRB,
top-speed of MB0405 Hisp. He succeeded about the top-speed. At the
cost of someboy's lunch which came from the stomach to the floor.
Apparently, when he sped, the bus started turning warm. 
3. mkIV dm cameo on 74 had a BC from hell too. Time taken from AMK
station to Montfort Sec: 7min. Apparently, this would not have been
achieved if the BC let passengers flagging it board VO3X behind.
Even when behind meant 3min behind.