When you keep things surprising or unexpected you're using the Keep Them On Their Toes strategy.
Use this strategy during daily routines, at playtime, or while sharing a story. It's a little bit of trickery and a lot of exaggeration but it's all for language learning.
Initiate a surprise within a routine so your child can practice requesting and questioning, vocabulary, problem solving, and using spoken language. Wait for your child to notice the unexpected and see what conversation follows.