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
雙喜臨門
双喜临门
double blessings arrives one after another
Cantonese
臨門一腳
临门一脚
lam4 mun4 yat1 goet3
the power to finish (the kick right beside the goal)