page 165 in the lightning thief
echinda attacks percy on the bus
I
The invisibility cloak
Percy killed Medusa at Aunty Em's Gnome Emporium after they ran from the bus.
Grover was freaking him out
he didn't wanna get expelled again
2
Ayo , was sup it's me... He doesn't want to leave his friend behind on the bus.
The Minotaur threw a cow at Percy's car causing Sally to swerve and crash.
In the case a school bus fight the most sensible thing to do is pull the bus over and for the driver to stop the fight before resuming the journey. Those fighting should be disciplined once at school.
they lose their luggage when they blew up the bus.
Percy made a bus explode with a Revolutionary War cannon and there was the whole "math teacher from Hades" thing.