Volume 3, Episode 16: When Heath accidentally shrinks the student bodies in Mad Science class, the guys and ghouls try to get back to size before Mr. Hack returns to the classroom.
Mr. Hackington showcases a powerful device of science to his class, but before he can show what the device does, he's called away by Headless Headmistress Bloodgood because of a dragon fire. Before leaving, Mr. Hackington says that he'll be back in five minutes and that if anyone touches the device, the whole class gets detention. Like always, Heath gets into trouble when he's bored, so he pokes around with the device until he turns it on, thereby shrinking the whole class.
Frankie tells everybody that Mr. Hackington is coming back to the class in four minutes and if he sees them like that, he is going to freak. Abbey says that there must be a reversal button on the machine, but Lagoona says it is too far to jump across. Heath thinks that he can fly the paper airplane, but the excitement gets to him and he burns the paper airplane. With one minute left Abbey uses a lab baster (with help from Clawd and Heath) and her ability, to make an ice bridge. Before they could use the device, a spider blocked their way, so Frankie had an idea where they would use Draculaura's fearleading skills to get to the ladder on the right setting.
Mr. Hackington returns and gives everybody detention. The ghouls are trying to find out how Mr. Hackington knows they played with the machine when the now-giant spider says that it wasn't him, thus revealing how Mr. Hackington found out their not-so-small secret.
- The webisode's title is a play on the 1989 movie Honey, I Shrunk the Kids.
- Heath being drawn to a recently unveiled Mad Science device and pushing buttons that he shouldn't also happened in Lagoona Blue's 'School's Out' diary.
- None of the students or the spider had the beam aimed at them when the lever was set on "undo". The fact that the lever's two positions are called "Shrink" and "Undo" also brings up the question why the spider got bigger, if the latter position only undoes the shrink effect of the former.