This was from the White House Twitter account:
President Obama: "We are here today because we know we cannot be complacent. History travels not only forwards, but backwards and sideways."
Some of the replies are LOL.
"The only history that travels backwards & sideways is revisionist history."
"Why can't history travel up & down? Directionist!"
"LOLwut? That's kooky talk."
"Time for another edition of "What If Bush Had Said This!"