Watford's defending of set-pieces has not been good enough and Luton have capitalised.
Luton have played really well and deserve their 2-0 lead.
If you think Luton are going away, think again. They lull Watford into a false sense of security, as if they are going to see out the clock, then spring a surprise, get the ball into the middle and after a poor clearance Allan Campbell slams home to spark wild scenes.
Four Added Minutes
Luton 1-0 Watford
They call this the M1 derby but if they're grading referee Josh Smith it would surely be an A1.