Some graffiti signatures (which were used to form this puzzle's four longest answers)

Question:

Answer:

Similar Crossword Questions:

Item with features that begin this puzzle's four longest answers
One is hidden in each of this puzzle's four longest answers
Instantly ... or how this puzzle's other three longest answers came about?
Word that can follow the first word of this puzzle's four longest answers
Each of the four longest puzzle answers has two pairs of them
Cash advance taken by this puzzle's longest answers
Obstinate, and what the other four longest puzzle answers are?
They're hidden in this puzzle's eight longest answers
Three-letter combinations hidden in this puzzle's six other longest answers
Theme of this puzzle hidden in the seven other longest across answers
Five of them are hidden in this puzzle's longest answers
Something associated with the first words of this puzzle's seven longest answers
Cyberchuckle, and a hint to this puzzle's four longest answers
Communications device described by the first words of the puzzle's four longest answers
Ones in charge of a case ... or a literal hint to the eight other longest answers in this puzzle
Julian Assange's controversial website, and a hint to what's missing from this puzzle's four longest answers
A different one is hidden in each of this puzzle's seven longest answers
Guess, in brief (and what's been added to this puzzle's longest answers)
Zamboni-prepared surface, and word that can follow the last word of the puzzle's four longest answers
String of letters found in this puzzle's longest Across answers
Words of reproach, and a hint to how the four longest puzzle answers are formed
Apt subject for today that's hidden in this puzzle's four longest answers
79, for the chem. symbol at the heart of the four longest puzzle answers
It precedes the last words of the four longest puzzle answers
ConfuseÂ—or what to do to four common phrases to form this puzzle's theme answers