how to get out of my BO offer

Call them up and tell them you have received a better offer, if you have already started working it is common etiquette to give them two weeks notice and continue working as planned for the next two weeks and then finally leave after that period of time.

Short Answer: Call up your BO manager and tell them you won't be working there. Do this as soon as you accept (sign for) the SA offer. Don't tell them where you're going.

Shorter Answer: Search function

So you would be turning down a BO internship for a FO SA?

Renege, respectfully. Say that you have decided to pursue other opportunities. Do not elaborate, or tell them where you will be working.

Even if you lose OCR in the fall and do not have an offer (this is the worst case) you are still better off with an IB internship.

Just say no.

Alright, I'll call her up right after I sign the offer. Thanks.

Congrats on the SA offer

Just send her this email:

Dear ___

Recently, I was at Macy's and I attempted to shoplift by wearing 3 pairs of Calvin Klein boxers under my jeans, but I was caught by the loss prevention staff, who run very quickly and are very strong. I tried to fight them but I lost, so I might be charged with assault as well as shoplifting. I am currently on my way to jail and I don't when I will be able to get out.

Kind regards,

__

I think after they see this email you won't have to go through any further trouble. They won't want you anymore and they will cut off contact with you.

Just fake your own death. It's really not that hard.