O'Felix had filled O'Tabby's sleeping pill prescription and popped a couple into his coffee, knowing it'd take O'Tabby an hour to get to Old Mountain Road, 40 miles away.
9 seconds sound clip from the Garfield's Babes and Bullets (1989) movie soundboard.
You can hear this line at 00:22:07.314 in the Blu-ray version of the movie.
Quote context
[...]
- There had better be a check in that envelope.
- Sam, how did you know O'Felix killed Professor O'Tabby?
- Professor O'Felix, the substitute girl Friday fixed that cup of coffee.
- Like clockwork, the pills took effect and O'Tabby drove off the road to his death.
- It was the old power struggle in the university routine, Kitty.
- With O'Tabby gone, O'Felix becomes the department head and gets what has eluded him all his life.
[...]