-^-^- needs to put saying "you're welcome" after someone says "thank you" into context.
Person 1: "This sandwich is delicious!"
Person 2: "No problem. I made it myself."
Person 1: "Thank you!"
Person 2: "You're welcome."
And right after that, and awkward silence ensues. Good luck trying to get out of that one without their opinion of you changing... It's happened to me one too many times...