I hate it when that happens. It's usually Moonsorrow for me. Like rhythm parts I hadn't originally heard, just absorbed subconsciously, and then I'll be listening to the CD and be like, "AW WHAT THE FUCK!"
I'm off work because I feel rather shitty today. Felt dodgy yesterday, but thought it'd go away. Woke up for work at like quarter to 5ish, couldn't breath for snot, sweating to fuck, and coughing. It was a fucking lovely way to wake up.