President who? Kid mistakes W for Washington

Dean

It’s been just a little over a month since former President George W. Bush moved out of the White House and back home to Texas, and already some people don’t recognize him.
The former commander in chief popped up this morning at an elementary school in Dallas, sticking his head into classrooms here and there, The Morning News reports.
In one room, Bush asked: \"Hey, kids, do you know who I am?\"
The young ones all gasped. Then one answered, \"George Washington!\"
POTUS #43 did not miss a beat(毫不犹豫 ). “That’s right!” he said. \"George Washington Bush!\"

pop up: appear
POTUS #43： 43rd Presidents of the United States

Dean

The current president of the United States is Barack Obama. George W. Bush has just lfet White House. George Washington was the first president of the United states.

Dean

not miss a beat also not skip a beat: to not pause

George didn't miss a beat when we asked him what kind of car we should buy for our daughter. Even when she's asked embarrassing questions, she doesn't skip a beat.

Usage notes: sometimes used in the form without missing a beat:

Ella forgot the words she had memorized but, without missing a beat, she made up new ones.