They are only silly because they so very pointless to say – like a 3 year old and 1 year old are really going to listen/understand.
“Don’t make a big mess.” (Said right before they manage to tear apart 3 rooms – with toys/objects spread throughout the house.)
“Try the food mommy cooked for you, you might like it.” (Usually said when I cook something like stew.)
“Nate, don’t give all your food to the doggy!” (Meanwhile, the dog is in heaven and the boy is smiling.)
“Stop pushing your brother down on the floor.” (Said as Nia is chasing him around the house – both are laughing hysterically.)
“Can we please stop screaming?” (Usually said right after the previous silly statement.)
“It’s night-night/nap time.” (Right after this one Nia begins to freak out about how she is not tired and doesn’t want to go to sleep.)
“Do you want mommy to lose her mind?” (This one comes after a really trying day.)
Are You Zhazha? 
I LOVE the last one! I have to laugh when I tell Drew he is driving me crazy and he smiles in that cheesy, baby way.