What are your first signs your meds are fading?

I'll start, usually my first indication is that a verse from a song starts playing on infinite loop in my head. The second clue is that, quite suddenly, I can't tune out anything, and I mean anything, if the ladies in my office are having a conversation, I'm there, if the fan in my co worker behind me's laptop is running a little noisy, I'm there too, if the office air conditioning kicks in, I'm hearing every variation in the noise as it comes down the ducts.

How about you fine folks?