Don't trust your boyfriend when he suggests that Christmas presents should not be exchanged between the two of you. He will get you a present and you won't get him one.
Cook the ground beef before you put it in the enchilada dish.
Don't ever mention that you have a nasty wart on your toe to anyone that you don't want to see it. They will incessantly bug you to show them.
Don't offer to drive someone to the airport in the hopes that they will decline the offer. They won't.
Dancing/singing in the library while filming to make a music video is more awkward than you think it will be.
Making a cake look pretty is not as easy as it sounds. Especially with homemade frosting.
If you ever get the chance to pet a llama, take it. SO WORTH IT. Even if they poop all over the grass in front of your apartment. Also, don't expect the poop to be cleaned up. Ever.