I've noticed that DS starts this crazy wild banshee screaming every time he is about to hit a developmental milestone - walking, vocab explosion, etc. He doesn't scream the rest of the time, at all - but during these times, holy cow!!! I'm constantly surprised people are still anywhere near us, and that the glass hasn't shattered.
So we are in a scream-y period, and I'm waiting to see what comes next! Does anyone else's toddler do this? What signs tip you off that something big and new is on the way?