Richard misses a package and is forced into an escalating feud with the delivery guy.
In 2019, this episode won a BAFTA for Best Writing (with Mic Graves and Joe Markham accepting the award).
Tropes:
- Double-Meaning Title: "The Slip" either refers to the piece of paper that Richard keeps getting or Mr. Gruber giving him the slip (as in tricking him) throughout the episode.
- Dr. Jerk: The Bandage Doctor tells Richard to keep it down as there are other people trying to pull cruel and elaborate pranks as well.
- Give Geeks a Chance: Richard's reason for pursuing the deliveryman is that he's doing it "for the slobs everywhere".
- Honor Before Reason: The delivery guy refuses to hand Richard his package, even though he's right in front of him, because he already entered it into the system as undelivered.
- Interrupted Bath: The episode opens with Richard playing with ducks in the bath, only to be interrupted by the doorbell. However, since he takes so long to get out of the bath and to the door, the mailman assumes nobody's home and refuses to give Richard his package. This kicks off the episode's main plot.
- Laborious Laziness: Richard also puts his honor ahead of reason as, rather just going to the depot and picking up his missed package, he's more willing to run all over town trying to catch the delivery man and get it from a collection point instead. Ultimately he elects to just buy the same item again and catch the delivery then, spending twice the money he would have just picking it up himself.
- Milking the Giant Cow: Parodied; The delivery guy likes to punctuate his statements with gestures only to botch them by using the wrong ones. His attempts at mocking Richard with a chicken call is undermined by him imitating an elephant.
- Pet the Dog: Presumably the reason Gumball and Darwin help Richard on his quest against the deliveryman.
- Revenge: Richard besmirched a deliveryman's record by falsely claiming he didn't ring the doorbell, who in turn spends the rest of the episode elaborately leading him by the nose.
- Whole-Plot Reference: The latter half of the episode is the protagonists running from location to location given over the phone by a villain with a German accent, just like in Die Hard with a Vengeance. To drive the point home, said villain at one point uses an ice cream truck for "Gruber's Ice Cream" that belongs to his brother Hans.
