These are two of my favorite humor fics, they're both related to the joke Teal'c told in Seth.

Title: What Do You Get If You Cross...
Author: pepper_field
Rating: G
Show: SG-1
Season/Episode: Seth
Warnings: none
Character Focus/Parings: Teal'c and Cassie Frasier
Brief Summary: No one gets Teal'c.

and the accompanying remix of the fic,

Title: Elephant Jokes
Author: 6beforelunch
Rating: G
Show: SG-1
Season/Episode: Seth
Warnings: none
Character Focus/Parings: Teal'c and Cassie Frasier
Brief Summary: In which Cassie and Teal'c are having acculturation difficulties, but it's mostly okay in the end.