Casper follows Kat to school. After her classmates give her a hard time, Casper pays them all back by tying their shoelaces together. When they try to leave, they all hit the floor in unison.
"Uh... boo?" (loud screaming)
The Up and At 'Em machine, especially with Carrigan and Dibbs.
The Ghostly Trio use Casper as an accordion, then flung him to the moon.
"Good byyyyeee!"
Kat and Stretch exchanging insults across the table. When Dr. Harvey tries to urge her off to school, she can't help but make one last parting remark.