Jimmy Fallon returned to the "Tonight Show" Monday after the death of his mother Gloria on November 4. Jimmy shared an emotional story about how his mom would hold his hand as a child and squeeze it three times, saying, "I love you." Jimmy mentioned that Taylor Swift was not scheduled to perform Monday, but was there anyway to sing. Watch Jimmy's heartfelt tribute to his mother, and Taylor's debut of "New Year's Day" on the show, which was her own tribute to Jimmy's loss.