Disappearing sound, and a hint to this puzzle's theme

Question:

Answer:

PFFT

Length:

Similar Crossword Questions:

Valentine's Day card signoff (and a hint to this puzzle's theme)
Staff members (and a hint to this puzzle's theme)
Gets past a last difficulty ... or a hint to this puzzle's theme
Winter feature with a hint to today's puzzle theme
Post office activity, or a hint to this puzzle's theme
Duo with the 1985 hit "Shout" (and a hint to this puzzle's theme)
Office building problem that's a hint to this puzzle's theme entries (see their last three letters)
Process by which an element's atomic number may be reduced, and a hint to this puzzle's theme
Disparaging name for someone who wears glasses (and a hint to this puzzle's theme)
Question that follows "O Brother" in film ... and a hint to this puzzle's theme
Aging consequence, and a hint to this puzzle's theme
Subject of the Final Jeopardy! question that knocked out Ken Jennings after a record 74 wins ... or a hint to this puzzle's theme
"All of Me" actress whose first name is a hint to this puzzle's theme
Party with too many dudes... or a hint to this puzzle's theme
Gain a monopoly, and a hint to this puzzle's theme and its location
Bartender's denial, and a hint to this puzzle's theme
Ralph Kramden catchphrase on old TV ... and a hint to this puzzle's theme
First name of a civil rights activist who would turn 85 today, and whose adopted last name is a hint to this puzzle's theme
Saying about power (and a hint to this puzzle's theme)
Nine-to-five routine, and hint to this puzzle's theme
Cassette deck feature, and a hint to this puzzle's theme
Certain spring training matches, and a hint to this puzzle's theme
"Gross!" (and a hint to this puzzle's theme)
Sphere, and a hint to this puzzle's theme
Afternoons, briefly (and hint to this puzzle's theme)