Cue O'Clock

Oh crud, it's quarter past zeppelin already!?

Type 1: In comedies, clock dials are occasionally seen with one or more of the numbers replaced by a non-numerical word or picture telling what will happen on the hour.

Type 2: A slight variation of this is when a character creates a fictional time based upon the actions of one or more other characters.

Examples of Cue O'Clock include:

Type 1

Xkcd has a wristwatch with Zeppelin O'Clock.
This image could be adapted for most Memetic Molesters.
Skalman from Bamse got an alarm clock like this. And he always follows it (there has been only one exception).
Otaku O'Clock
The Weasley family has a clock which has nine hands and doesn't tell time at all. It just shows where each of the family members currently are. ("home," "school," "work," "travelling," "lost," "hospital," "prison," and "mortal peril.") Molly also has one to tell her to do things like "Time to make tea", "Time to feed the chickens" and "You're running late".
The title character of the Classic Disney Short "Donald's Cousin Gus" has a watch that tells mealtimes.
Used in one of the puzzles of The Impossible Quiz.
This clock.
In the My Little Pony Friendship Is Magic episode "Baby Cakes", Pinkie Pie glances at a wristwatch with a picture of her face at the top while waiting for her chance to play with the Cakes' newborn twins some more.

Type 2

In the House episode 'Simple Explanation' Kutner does not turn up for work and Taub puts forward an obviously fictitious cover story for him, saying that his dog is sick and he will be there by lunch. At lunchtime House looks at his watch and says "Look at the time. It's half past Taub-was-lying-about-Kutner."
"Sounds like Pimms o'clock!"
The Adventures of Dr. McNinja: "We are on Eastern Pain Time and it's Dan O' Clock!"
- All mixed drinks are half-off from Dan O'Clock to Dan Thirty.
Shirtless O'Clock
In the song "Party on Fountain":

What time's it at?

It's at Party O'Clock

A magazine article from the 1920s said that it was "Sex O'Clock in America".
Good heavens, just look at the time!
An ATC Tower relaying local time to an inbound aircraft, "...If you're a civilian, it's 3:00; if you're Air Force, it's 1500; if you're Navy, it's Six-Bells, if you're Army, the big hand is on '3' & little hand is on '12'; if you're Marine, it's 2 hours until the bar opens!
The description for one of the watches you can put on your Rock Band character claims it to be "rock o'clock".
The term "beer thirty".