My pastor was explaining a passage and said that the first few verses were setting the stage for the three-part sermon and this comic sprang to mind. Jello can take a while to set - I have no clue how long a whole stage floor would take (obviously it would depend on the size of the stage and the temperature of the room - it would need to be fairly chilly).
Text:
A: You covered the entire floor in JELLO?!?!?!
S: Don't go out there! The stage isn't ... set. :)
