"A rose by any other name...."
"A slight miscalculation in the direction the wind was blowing!"
"A star is born"
"A strike? That's when a minority group inconveniences the maximum amount of people, and getting a raise for doing it."
"A word of caution... Don't preface your opening statements with 'I'll bet you...' .."
"Abandon ship!"
"About that partidge in a pear tree...."
"Above it all."
"According to the chart, we're in dire straits."
"Acid rain."