The thing you fear most in mahjong is dealing the winning tile.
Tips
culture
In mahjong, 点炮 means discarding the exact tile another player needs to declare 胡 (win). The discarder usually pays the full hand value to the winner under 点炮包 rules.
memory
Literal meaning is 'to light the cannon', in mahjong, you 'fire the cannon' that blows up your own wallet.