Obama gives 'superhero' fist bump before departing White House

President Barack Obama greets Luca Martinez, 4, with a fist-bump as he walks from the White House to board Marine One.

Washington (CNN)President Barack Obama doesn't stop very often when he walks out of the White House to board Marine One.

But usually a little boy in goggles and superhero clothes isn't part of the press corps.
4-year-old Luca Martinez came to the South Lawn with his dad, an Associated Press photographer, on a perfect Saturday to see the President's helicopter up close.
Luca wore big goggles to protect his eyes during takeoff, and covered his ears the whole time because of the noise. Except for one moment.
    Obama foregoes handshake for fist bump with little boy
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    That was when the President spotted him as he was walking towards the helicopter. With a big smile, Obama came over to the press pen and gave Luca a fist bump. His father, Pablo, usually the one taking the pictures, will probably be collecting some others for this moment.
    Luca seemed unphased ‎by the whole experience, but said it was fun when reporters asked him about it. Martinez says they live nearby and often see Marine One fly overhead.
    It was his son's second time seeing the helicopter up close, but the first with a presidential meeting.
    Obama spent the rest of the day at Camp David, his 36th visit to the presidential retreat.