The situtation: we were playing the Shackled City adventure path (chapter 2 of the book). The PCs are currently exploring a goblin warren. It has a bunch of 5' wide corridors, but unlike There is No Honour, there are plenty of connecting passages (it's non-linear, in other words, so the goblins can approach from many directions), and the rooms are quite big. In this case, the room was 25'x25', and had two exits (N and S), both of which were accessible to the goblins.
Oh, and we only had 4 PCs at this time. Not that it would have mattered for what I'm about to relate:
The PCs had set off an alarm, alerting the goblins to their presence. They retreated to this room, with goblins pursuing from the north. Goblins on guard to the south made their Hide checks, and attacked with sniper fire. Right... Most PCs moved to the south entrance and killed those goblins, leaving one PC stopping goblins from coming in from the north. (Standing directly in front of the 5' wide door).
A lot of goblins ran down from the north. The first tried to Bull Rush his way past the PC, and was slain by an AoO. The second tried to Bull Rush... and the PC lost the opposed roll. (I think I rolled a natural 18). Then all the rest of the 15 goblins ran into the room, provoking AoOs from the remaining PCs, but pretty much filling the room completely and flanking everyone!
That was fun. Yes, the 4th-level PCs killed the goblins, but it was a nice moment.
(I ran 7 combats in that 3-hour session.
)
Cheers!
Oh, and we only had 4 PCs at this time. Not that it would have mattered for what I'm about to relate:
The PCs had set off an alarm, alerting the goblins to their presence. They retreated to this room, with goblins pursuing from the north. Goblins on guard to the south made their Hide checks, and attacked with sniper fire. Right... Most PCs moved to the south entrance and killed those goblins, leaving one PC stopping goblins from coming in from the north. (Standing directly in front of the 5' wide door).
A lot of goblins ran down from the north. The first tried to Bull Rush his way past the PC, and was slain by an AoO. The second tried to Bull Rush... and the PC lost the opposed roll. (I think I rolled a natural 18). Then all the rest of the 15 goblins ran into the room, provoking AoOs from the remaining PCs, but pretty much filling the room completely and flanking everyone!
That was fun. Yes, the 4th-level PCs killed the goblins, but it was a nice moment.

(I ran 7 combats in that 3-hour session.

Cheers!