To err is human; to purr, feline.
To err is human; two curs, canine.

To err is human; to do nothing, benign.
To err is human; to quit, resign.

To err is human; to howl, lupine.
To err is human; to solve, design.

To err is human; to moo, bovine.
To err is human; to soothe, calamine.

To err is human; to pretend, pantomime.
To err is human; to bloom, columbine.

To err is human; to prance, equine.
To err is human; to add, combine.

To err is human; to befriend, pal o' mine.
To err is human; to woo, Valentine.

To err is human; to horrify, Frankenstein.
To err is human; to straighten, align.

To err is human; to drown, Clementine.
To err is human; to twist, serpentine.

To err is human; to love, sublime.
To err is human; to cut in, go back in line!