Time Control as a ‘chess piece’

What to do if your opponent doesn't hit their side of the chess timer? Stare at the board as though you are contemplating a move until either they realize their mistake or their time runs out.

Seriously though, I think the point is that time controls are as much a part of "the game" as the pieces are. Learning to manage time (don't rush, but don't needlessly dawdle looking for a better move) is as much a way to improve as learning openings or endgames.

The point Hikaru was making when he said "time is a chess piece" is that the player also has to move the clock. 

Chess has strategic elements which are roughly: force, time, space, king safety, and pawn structure. Time here means tempo or efficiency of moves. However, when the clock runs low or you are playing short games, clock time also becomes a strategic element that influences your decisions. I know this isnt quite the original question or what Hikaru meant. Just offering another way of thinking about time and how it can fit into existing frameworks (analogy).

I suspect that that would be regarded as unsporting in many quarters.

A famous cricketer (Andrew Flintoff) had an account of how he dis this at school and got into trouble for winning that way.