Rhys Healey's stoppage-time goal ensured a point for Watford as they drew 1-1 with fellow play-off chasers Southampton.
Ken Sema and Francisco Sierralta had good efforts for the Hornets shortly before the break in a cagey opening period at Vicarage Road.
Che Adams broke the deadlock when he swept home Adam Armstrong's header to put the visitors in front after both sides had gone close.
But late substitute Healey's shot following a Vakoun Bayo header ensured a dramatic end to the game.
The 10th-placed Hornets are two points off the play-off places as a two-game winning run came to an end while Saints stay fourth.