How do you respond to an extravagant gift?

One of my bffs showed up on Thursday with a brand new iPad as a gift for me. She apparently decided that since she loved hers so much, she wanted me to have one also.

At first, I told her I couldn’t accept it, but she was having none of that, so I said “thank you” a million times, and threatened her to not argue about me paying for our movie trips for about a year (at least)... but I felt like I couldn’t find the right words, and that my thank yous were inadequate.

Have you experienced receiving such an extravagant gift? If so, how did you respond? If not, how do you imagine you would respond?