granny cannon

The seats on the bus that are oriented in the direction of travel and elevated above the seats in front. They are favoured by older ladies and do not feature a handlebar. So, in the event of a head-on collision, the passenger will be propelled in the air and towards the front of the bus, hence the name.

"Hey dude, wanna sit next to me in this 4-seat?"
"Nah man, I've got my eyes set on the granny cannon."