I think I've made one of these before, but it wasn't based on TEF, so i'm going to make it more fun and TEF-y (that's a word).

Start with the month you were born in:

1. I cast a pelt spell to
2. I cast an antler spell to
3. I cast a mask spell to
4. I cast a mini spell to
5. I cast an animal spell to
6. I bucked
7. I killed
8. I poisoned
9. I peacocked
10. I danced with
11. I swapped lives with
12. I repopulated the forest with

Then add the day you were born:

1. a deer
2. a moose
3. a dove
4. a frog
5. a homeless person
6. a crazy cat lady
7. the Twin Gods
8. a dog
9. a cat
10. [choose a random TEF member and put his/her name here]
11. a house
12. a jackal
13. the TARDIS
14. a wolf
15. a caracal
16. Neko
17. a bag of jelly babies
18. a weeping angel
19. the nice man with the white coat
20. my butt
21. [choose a random character and put his/her name here]
22. a tree
23. a pine cone
24. a mushroom
25. the Crying Idol
26. the bridge
27. Dr. Octagonapus
28. [go to the forest, and on the map click the pictogram nearest you. put his/her name here]
29. Amaterasu
30. a fox
31. the Big Zombie Deer

Then, add the one with the last digit of the year you were born (ex. if you were born in 1980, your phrase is 0)

0. because I'm a boss.
1. because the voices told me to.
2. because the Twin Gods told me to.
3. because the forest would be burned down if I didn't.
4. so I can get a pine cone.
5. because meth is a helluva drug.
6. so I can be rewarded with jelly babies.
7. to earn one of the 13 brush techniques
8. because I was bored.
9. because I'm insane.

Now add together all the parts of your sentence and post what you get.

Mine is:

I repopulated the forest with a dog because I'm insane.

... I'm creeped out at myself.