  The concept of fake particle, or "fakeon", allows us to make sense of quantum
gravity as an ultraviolet complete theory, by renouncing causality at very
small distances. We investigate whether the violation of microcausality can be
amplified or detected in the most common settings. We show that it is actually
short range for all practical purposes. Due to our experimental limitations,
the violation does not propagate along the light cones or by means of
gravitational waves. In some cases, the universe even conspires to make the
effect disappear. For example, the positivity of the Hubble constant appears to
be responsible for the direction of time in the early universe.
