Rashford has provided us with some memorable moments in his fledgling career, but there was nothing to admire in the way he persuaded referee Neil Swarbrick to point to the spot.
Did Lukasz Fabanski even make significant contact with his opponent? It hardly mattered. Rashford had already made up his mind to go to ground after racing onto Jesse Lingard's throughball and touching it past the advancing Swansea goalkeeper.
The penalty was given and Wayne Rooney stepped up to give United a 1-0 lead just before halftime.
Gylfi Sigurdsson's free kick however dented United's Champions League hopes.
It was a deflating way for fifth-placed United to set a club record unbeaten streak: 25 matches dating back to Oct. 23. A more important statistic is the 14 league games they have drawn this season, 10 in front of their own fans.
Swansea, though, is now only two points from safety with three games to go.