English: United States President Barack Obama bends down to allow the son of a White House staff member to touch his head during a family visit to the Oval Office on 8 May 2009. The boy wanted to see if the President's haircut felt like his own. The image has become known as "Hair Like Mine"

From The New York Times, 23 May 2012:

The boy in the picture is Jacob Philadelphia of Columbia, Md. Three years ago this month [in May 2009], his father, Carlton, a former Marine, was leaving the White House staff after a two-year stint on the National Security Council that began in the Bush administration. As departing staff members often do, Mr. Philadelphia asked for a family photograph with Mr. Obama.

When the pictures were taken and the family was about to leave, Mr. Philadelphia told Mr. Obama that his sons each had a question. In interviews, he and his wife, Roseane, said they did not know what the boys would ask. The White House photographer, Pete Souza, was surprised, too, as the photo's awkward composition attests: The parents' heads are cut off; Jacob's arm obscures his face; and his older brother, Isaac, is blurry.

Jacob spoke first.

"I want to know if my hair is just like yours," he told Mr. Obama, so quietly that the president asked him to speak again.

Jacob did, and Mr. Obama replied, "Why don't you touch it and see for yourself?" He lowered his head, level with Jacob, who hesitated.

"Touch it, dude!" Mr. Obama said.

As Jacob patted the presidential crown, Mr. Souza snapped.

"So, what do you think?" Mr. Obama asked.

"Yes, it does feel the same," Jacob said.