This is just a little thingy. It takes place in Season 1, about 3 months after Teal'c joins SG1. Hope you enjoy.
FOOTHOLD
"O'Neill!" The word came through the phone in a hiss.
"T? What's wrong?" Jack, blinked, trying to shake himself awake. He held his cell closer to his ear. "I can barely hear you…"
"The SGC has been invaded, O'Neill!" Still in the whispery hiss. "It is a handhold!"
"What?! Invaded? Do you mean a foothold?" Jack jumped out of bed. The alarm clock read 6:12 a.m. "When? How? Where are you, T?"
"I am in my quarters, O'Neill. I emerged from several hours of kel-no-reem a while ago and went out into the corridor. The base is filled with aliens!"
Jack had already pulled on his trousers, and grabbed a shirt from the back of a chair. "Goa'uld?"
"There are several different kinds of aliens. Some have seriously deformed faces, and no eyes, and are making grunting noises. Some appear to be skeletal. One was three meters tall, and had some green jelly substance oozing from his body."
In the foyer, Jack grabbed his boots and sat down to put them on. "T, did you see any of our people?"
"I did not, O'Neill. We appear to have been overwhelmed."
"I'm out the front door right now, T… Wait a minute! What did you say about skeletons?" Jack stopped with his hand on the truck's door.
"Someone is at the door, O'Neill."
Jack could hear the pounding.
"It is one of the invaders…" Teal'c's war cry made Jack yank the phone away from his ear.
Someone was screaming in the background.
"Teal'c! What the—Ow, ow! Teal'c! Stop it! What are you doing! It's me—Daniel! Cut it out!"
Jack nearly dropped the phone, as he slid down the side of the truck, laughing so hard he could not stay on his feet.
No one had thought to warn Teal'c about Halloween!