OP here.
>>1416771 is a good one. Not sure about
>>1416787 since the whole thing looks to be more like some kind of skit
I was thinking more along the lines of
- A performance of Down with the Sickness where David holds off on the OH WAH AH AH and just grins at the audience
https://youtu.be/G19UqSnNuO8?t=57- When James Arthur performs Rewrite the Stars, he's like "Please welcome Anne-Marie! Just kidding, she's not here". He pulled this at least twice
https://youtu.be/LsoRiyyaBfM?t=58 
