  Aims. We address the problem of young stellar objects that are found too far
away from possible star formation sites. Different mechanisms have been
proposed before to explain this unexpected circumstance. The idea of
high-velocity protostars is one of these mechanisms, although observational
support is not always easy to obtain. We aim to shed light on this issue after
the serendipitous discovery of a related stellar system. Methods. Following the
inspection of archival infrared data, a peculiar anonymous star was found that
apparently heads a long tail that resembles a wake-like feature. We conducted a
multiwavelength analysis including photometry, astrometry, and spectroscopy.
Together with theoretical physical considerations, this approach provided a
reasonable knowledge of the stellar age and kinematic properties, together with
compelling indications that the extended feature is indeed the signature of a
high-velocity, or runaway, newborn star. Results. Our main result is the
discovery of a low-mass young stellar object that fits the concept of a runaway
T-Tauri star that was hypothesized several decades ago. In this peculiar star,
nicknamed UJT-1, the interaction of the stellar wind with the surrounding
medium becomes extreme. Under reasonable assumptions, this unusual degree of
interaction has the potential to encode the mass-loss history of the star on
timescales of several $10^5$ years
