My son the (quiet) philosopher...

7 y/o son: <incessant unnecessary noise>
Me: Please be a little quieter.
7 y/o son (thoughtfully): What does "quiet" mean anyway? Nobody knows!
7 y/o son: <resumes incessant unnecessary noise at previous volume>

Dropping Dolphins...

5 y/o (shouted from the kitchen in a tremendously overly dramatic voice): Why are you dropping dolphins?

I'm immediately concerned that my children have got somehow involved with some new recreational drug (like dropping acid), but fortunately they are just playing with LEGO... which involves dolphins.