Mileta Rajovic scored a 92nd-minute equaliser for Watford as they fought back to seal a Championship draw against managerless Millwall.
The hosts took the lead early on courtesy of Yaser Asprilla but Watford's lead lasted just five minutes as Millwall responded.
Zian Flemming nodded home for the Lions following some good work from Casper de Norre to level the scores.
Millwall thought they had won it via another header, this time as George Saville's corner was met by Wes Harding late on, but Rajovic sent home Imran Louza's cross to rescue a point.
The result means Watford have stretched their unbeaten run to four games and are 16th in the Championship table, while Millwall are two places below them having missed out on a morale-boosting late victory.