is there one for the inevitability of catastrophe during a big presentation? hence the ritualistic offering to the 'demo gods' (personally i break something o

is there one for the inevitability of catastrophe during a big presentation? hence the ritualistic offering to the 'demo gods' (personally i break something on purpose right before the demo, so that the 'something will go wrong' had had already 'gone wrong', but i'm now in a much better position to fix it live (no troubleshooting your own bug))