A week ago I dreamed I was attacked by an octopus but it wasn't half as scary as this real life horror

For reference: the octopus was originally a T-Rex about the height of a human and I had to keep my hand on a door handle to stop the T-Rex from getting into the classroom. Annoyingly the T-Rex then became an octopus and slid through the suddenly-existing letterbox in the middle of the door and I woke up.