Me: Olivia, you can't play with that.
Olivia (almost 2 yo): I Want It !!!!! (In screaming meltdown mode)
Me: Mamma said no.
Olivia: (very calmly) Alessia can you reach?
Alessia (3.5 yo): Mamma, mamma, Olivia is trying to touch a mess that someone made.
Me (internally - that could be nothing, or that could be something really bad): Show me, Alessia.