Replicating a sweet moment from the last time the two met publicly, former President George W. Bush and former First Lady Michelle Obama are putting their unique friendship on full display again. As Bush and his wife, Laura Bush, entered the National Cathedral ahead of the state funeral for his father, former President George H.W. Bush, the 43rd president stopped to shake hands with other presidents and first ladies seated in the front row. Bush appeared to slip a piece of candy to Michelle Obama as he shook her hand, leading to a smile from the former first lady.The two friends have made headlines over the years for their relationship. At the funeral for Sen. John McCain in September, a clip of Bush sneaking Obama a piece of candy went viral, with folks commenting about the sweet moment. The same could be said about the moment at the elder Bush's funeral. "Bush handed Michelle CANDY!! In his grief, he remembers to carry on the cutest of gestures," one Twitter user wrote. "Watching George W. Bush hand Michelle a piece of candy reminds me - there can be civility in politics," said another. Bush and Obama are surprisingly close considering their political differences, and they have often been seated next to each other and photographed together at formal events. A photo in September 2016 of their warm embrace at the opening ceremony for the Smithsonian National Museum of African American History and Culture also went viral.In an interview last year with People magazine, Bush credited the former first lady's appreciation of his sense of humor as a key reason for their friendship. "She kind of likes my sense of humor. Anybody who likes my sense of humor, I immediately like," Bush told the magazine. "When I saw her, it was a genuine expression of affection."CNN contributed to this report.