I’d be mightily impressed if we clocked up -20 odd!
18.5 Deliberate short runs
18.5.1 If either umpire considers that one or both batsmen deliberately ran short at that umpire’s end, the umpire concerned shall, when the ball is dead, call and signal Short run and inform the other umpire of what has occurred and apply 18.5.2.
18.5.2 The bowler’s end umpire shall
- disallow all runs to the batting side
- return any not out batsman to his/her original end
- signal No ball or Wide to the scorers, if applicable
- award 5 Penalty runs to the fielding side- award any other 5-run Penalty that is applicable except for Penalty runs under Law 28.3 (Protective helmets belonging to the fielding side)
- inform the scorers as to the number of runs to be recorded
- inform the captain of the fielding side and, as soon as practicable, the captain of the batting side of the reason for this action.
It is actually possible. Though it would take Boycott level stubbornness not to learn from the first offence.