Thomas K. , Dec 03, 2011; 02:59 p.m.
High mirror slap is performed at Nikon headquaters with EVERY succesfull camera. It's a form of "high fives" using SLR mirrors. They can be very loud, aspecially with accompaning cheers (all in japanese). Low mirror slaps are as loud as high ones. But all this pales to the legendary chest mirror slaps performed by the designers of Pentax 6x7 after it's succesfull release.