Many police officers watch for vehicles without headlights because it's a telltale of a drunk driver.
Know how to behave at a fine restaurant, which is a telltale measure of social maturity.
How does Love speak? In the faint flush upon the telltale cheek, And in the pallor that succeeds it; by The quivering lid of an averted eye-- The smile that proves the parent to a sigh Thus doth Love speak.
A wise reader reads the book of genius not with his heart, not so much with his brain, but with his spine. It is there that occurs the telltale tingle.
People stared. Maybe because they were giants compared to everyone else, both in height and muscle mass. Maybe because of the telltale bulge of weapons at their waist. Or maybe because William opened a bag of Doritos and ate while he shopped. Hard to tell.