Harry Potter and the Philosopher's Stone/Harry Potter and the Sorcerer's Stone - Pain or No Pain?
When Harry Potter goes to the Leaky Cauldron on his birthday with Hagrid, he shakes hands with Professor Quirrell, and there is no problem there. Near the end of the book when Quirrell grabs Harry, both Quirrell and Harry are in pain. Harry's scar hurts, and Quirrell's hands hurt. Whenever Quirrell touched Harry's bare skin, he was in pain. I do not know about you, but I cannot think of any explanation about this.