So I ran the ogre encounter last night. And as usual, the party did something I hadn't accounted for. The Bromm, the dwarven bard, used his boots of spider climbing to run up the side of the tower in an attempt to man the ballista. You know, you kick yourself for the magic items you give your party.
So I went with my original plan to grab a character and pull them behind the keep's wall. Oona took hold of the warrior priest Brother Edgar and was ragging him to the soup pot. However this left her open for an attack of opportunity. (Which I fucked the ruling. I let the wizard G-Bach cast a spell). 'Hideous laughter' came and knocked my idiot of an ogre down. ( I grabbed my player with both hands and while acting in character, I said 'You funny guy' and fell over laughing. This brought a round of chuckles from the table).
Surprisingly, my giant vultures were giving them a hard time. A guess a flying creature with a breath weapon will do that. (If you want a fun creature, allow you giant vultures to projectile vomit one per day. It's what real vultures do when threatened. I treated the attack as 'Melf's acid arrow). I knocked out the rouge halfling, Bey and Bromm with the breath weapon. Albeit Bromm helped my cause as he launched himself with the ballista in an attempt to attack the flying vulture. (Yea, this makes no sense if your trying for realistic game play, but I appreciate good slapstick). With a missed attack he plummeted 20 feet to the ground taking 2d6 damage.
The save to break Hideous laughter was near impossible with the -2 penalty and when I final did, they hit me with it for another round. From there they slowly worn down Oona and her birds. Everybody had a good time, so I don't mind my AOO screw up.
You may ask why I didn't use the goblins. Well, at the round I had intended on pulling them in, the party was two members down. An additional 10 goblins with bows would have lead to a TPK. So in turn, I waiting until the party finished the fight, then I had the goblins drive them out of the towers and steal their cart and horses. In fairness it was rewarding watch the party run from a group of goblins that they would normally smoke.