Weirder than I thought.
"Obama!" Bush exclaimed, according to Obama's account of the meeting in his second memoir, "The Audacity of Hope." "Come here and meet Laura. Laura, you remember Obama. We saw him on TV during election night. Beautiful family. And that wife of yours -- that's one impressive lady."
The two men shook hands and then, according to Obama, Bush turned to an aide, "who squirted a big dollop of hand sanitizer in the president's hand."
Bush then offered some to Obama, who recalled: "Not wanting to seem unhygienic, I took a squirt."