Steve Bruce warned his Hull side not to let their standards slip after playing their best football of the season so far in a 4-1 win over Millwall.
The Tigers cruised to a 4-0 half-time lead with the help of three goals in eight minutes.
Jay Simpson, Abdoulaye Faye and Sone Aluko struck in the closing stages of the half to put the game beyond the visitors after Robert Koren had fired the Tigers ahead in the 14th minute.
But Bruce was unhappy his side took their feet off the gas after the break, allowing striker Darius Henderson to grab a consolation goal for Millwall midway through the second half.
Bruce said: "The first half was terrific, we played some really good football. I think most teams would have struggled to play against us when we perform like that.
"But the human brain is a funny thing when something gets too easy and that's what we saw in the second half.
"If I'm going to be critical, the second half was exactly the opposite of what we wanted but, overall, I'm delighted with the win.''
Millwall manager Kenny Jackett opted to match the Tigers' 3-5-2 shape and it went horribly wrong. He said: "We tried to match up and get tighter to their midfielders.
"Maybe we should have gone to 4-4-2 sooner, but we were breaking quite well and getting the ball to our forwards' feet but our final ball wasn't good enough.
"Hull played with a lot of tempo and it was hard for us to stop them moving the ball and getting into good shooting opportunities.''