I was listening to Opeth a few weeks ago, as you do, and I happened to be drinking beer at the time as well. Anyway, one of the songs on Watershed came on, didn't know which it was at the time, and I wasn't listening to all the lyrics but suddenly I heard (in one of the growling bits) "just give me some beer" and I burst out laughing and rewound it to listen again! I tried looking up for the lyrics but I didn't know which song it was at the time, so didn't find out. I later listened to the album again (when I wasn't drinking beer), had to listen closely to find the bit where it said it, and it STILL sounded like that (I hadn't imagined it then!), and then I found out which track it was, so I looked up the lyrics and found out what it really said, and there you have it!