CC Antya 1.94

eka-dina rūpa karena nāṭaka likhana
ācambite mahāprabhura haila āgamana
Synonyms: 
eka-dina — one day; rūpa — Rūpa Gosvāmī; karena — does; nāṭaka — drama; likhana — writing; ācambite — all of a sudden; mahāprabhura — of Śrī Caitanya Mahāprabhu; haila — there was; āgamana — the coming.
Translation: 
One day while Rūpa Gosvāmī was writing his book, Śrī Caitanya Mahāprabhu suddenly appeared.