A note from the younger crowd:
When I was in 6th grade and coming back from a week-long outdoor education trip, I annoyed my fellow students by singing 100 bottles of beer on the wall the entire way. My method of continuing was to run it something like this:

(100.....1) bottles of bear on the wall
One bottle of beer,
take it down pass it around, no bottles of beer on the wall.

0 bottles of beer on the wall
0 bottles of beer,
Drink some down,
as you pass one around,
-1 bottles of beer in the room
(continue to -100)
    (this is assuming that you took them down, but didn't DRINK it originally)

-100 bottles of beer in the room,
-100 bottles of beer,
Buy one more, bring it on in,
-99 bottles of beer in the room.
(continue to -1 bottles)
-1 bottles of beer in the room;
-1 bottles of beer;
buy one more, bring it on in,
-0 bottles of beer in the room.

0 bottles of beer on the wall
0 bottles of beer,
take the tag off,
put it on up,
1 bottle of beer on the wall.
(continue to 100....repeat from top)


*shrug* Like I said, I was trying to annoy them; I made it down, back up, and had gotten back down to 47 bottles by the time we returned to my school--meanwhile, people had tried everything they could think of to stop me, including "The Song that Never Ends"...lucky that I'm not affected by that one. To put it mildly, everyone was rather glad to get off of the bus.
Anyway, the other thing I remember from elementary school/junior high was the variant,
0 bottles of beer on the wall,
0 bottles of beer,
throw some back up,
put the cap on,
1 bottle of throw-up on the wall.

SOC