In athletics, the false start rule used to be:
If you false start, you get a warning. If you do it again, you are disqualified.
From next year, the rule will be:
If you false start, you are immediately disqualified.
I am happy with either version - the old one made for more build-up and tension, but did mean things ran over.
However, the current rule is a joke. Currently:
If anyone false starts, the whole field gets a warning. Anyone who then false starts is disqualified.
For example, today, in a World Championship 100m quarter final, lane 6 false started. Everyone got a warning. Then, lanes 2 and 3 false started and were disqualified. Lanes 2, 3 and 6 all made the same mistake, but lane 6 wasn't disqualified because he did it first.
This is the number one stupidest rule in sport. I remember thinking this when they introduced it, and I am delighted to see it being changed for next year.