My baby cousin did this to my aunt one day.
Praise
Nashi knew when he did something good, his mommy and daddy will say "Good boy!" So Nashi make's sure to throw his trash away, wash his hands and hug his mommy just so he can hear it. He likes it a lot!
Momma and daddy will hug him and tickle his belly until he squeals happily.
So when he was brought to the guild for dinner one day, Nashi saw someone do something good. Running over to pull at Mirajane's skirts, he waited until she shook the suds from her hands to kneel down to him.
"Hello Nashi-kun!"
He pointed at the sink where she had been washing the dishes she had collected. "Mira wash?"
Smiling gently at him, she nodded. "Ah huh. Mira washes the dishes."
Nashi grinned wide and patted her hand. "Good boy!"
Till the next one!
Got any ideas for one? Let me know!