What to say when something that pleases you happens

كَانَ النَّبيُّ صلى الله عليه وسلم إِذَا أَتَاهُ أَمرٌ يَسُرُّهُ أَو يُسَرُّ بِهِ خَرَّ سَاجِداً شُكراً لِلَّهِ تَبَارَكَ وَتَعَالَى

English meaning

The Prophet PBUH would prostrate in gratitude to Allah upon receiving news which pleased him or which caused pleasure.