Last night I watched a full BBC Proms concert from 2008 on Youtube. It was Bernard Haitink with the Chicago Symphony at Royal Albert Hall, featuring Mahler's 6th.
At a crucial point in the final movement, the final section is introduced most unusually, almost shockingly.
In the percussion battery sits an octagonal wooden object, like an oversized ottoman, with a round wooden disk on top. Then there's this, well, sledgehammer. At the crucial moment, this diminutive Asian percussionette winds up that hammer and gives one homeric whack on that wooden ottoman. And she had to anticipate the right instant by probably 1.71828 beats in order to start the hammer swing on time.
It reminded me of nothing more than that epic commercial of 1984 introducing the Macintosh.