Why? If you read the thread properly, you will see that somebody mentioned that it wasn't possible to get detonation on the ground. I simply pointed out that it was very possible, if unlikely.
Of course I recommend running the engine up a bit before shutdown. Many POH's specifically suggest this, i.e C152 1500rpm for 10s. It does make a big difference, especially on a/c that are poor starters. Often plug fouling is a major cause of starting problems. Just don't do it with the tail pointing at a
hangar door! Open or otherwise.