My two things:

• “What’s the order when you go through the door?” writing on notepad, then stopping “So the wizard is in the middle? Okay…”
• We play with maps on a TV and I usually add numbers to the bad guys for clarity in a battle. They were going into a dungeon and ran into six small shrubberies that ate their lunch. Came close to a TPK ‘cause they were cocky. Lesson learned, two rooms later they go into a room they can only see half of. In that half are four of the shrubberies numbered 1, 2, 24, 25. The bard: “Holy shit! There are TWENTY FIVE of them in here?” They were quite surprised that they couldn’t find the other 17 since there were only 8 of them.