The 30-year-old provoked a mass outpouring of applause and recognition when he took to the field for the final moments of a game which captivated all present from start to finish.
United made a promising start, but almost fell behind when Dean Bowditch thudded an effort against Conor Devlin's crossbar. Ravel Morrison was thwarted in a one-on-one with Glovers goalkeeper John Sullivan and Joshua King was crowded out by a pack of defenders, before United took the lead eight minutes before the break.
Cameron Stewart's cross found King, and the Norwegian front-man picked out Possebon, who stroked home the opening goal from the edge of the penalty area.
Ole Gunnar Solskjaer and Warren Joyce made just one half-time substitution, bringing on Brady for Possebon, but the Reds' rhythm was thrown off-kilter by an amazing start to the second period from the hosts.
Just two minutes had elapsed when Jean-Paul Kalala smashed an unstoppable 25-yard effort past Devlin, and the United goalkeeper was beaten again two minutes later as Sam Williams stabbed in from close range.
The enraptured crowd watched on in disbelief as Adam Virgo headed home Yeovil's third goal