Harlequins boss Conor O'Shea admitted his side got out of jail after an extraordinary comeback earned them a 42-40 victory over Wasps.
The champions looked dead and buried at 40-13 down on 56 minutes, but they scored four tries to snatch an astonishing victory in the Aviva Premiership curtain-raiser.
"I never want to go through that again," said O'Shea.
"I did think the game was gone. Our set-piece was poor, our discipline, they won the contact areas and when we turned the ball over they stung us.
"It was a long way back - but we got a lot of energy from the bench. The Tom Guest score from the charge-down (the first of their four second-half tries) just gave us a little bit of hope. The more we played, the more we held onto the ball.
"We started winning the collisions, we got our offloading game going. We are delighted to get away with that but we know defensively we are miles better than that."
Wasps counterpart Dai Young admitted he feared the worst after Guest's try.
"For 50 minutes we probably played as well as we have done since I have been at the club," he said.
"We talked at half-time about not switching off and keeping our concentration and how good a team Quins were and that they would keep playing.
"It wasn't a surprise for us. I thought the charge-down kick gave them that momentum and for the last 30 we struggled to get our hands on the ball."