There’s a saying that goes, "Fortune always comes in pairs." But there’s another saying that says, "Fortune comes, but never in pairs, while misfortune always does."
Examples (粵典–words.hk)
Cantonese
双喜临门
雙喜臨門
double blessings arrives one after another
Cantonese
临门一脚
臨門一腳
lam4 mun4 yat1 goet3
the power to finish (the kick right beside the goal)