The defender moved to the Old Trafford in 2004 at the age of 17 before returning to Barcelona.
Tonight his team will travel to Manchester for the first leg of the Champions League quarter-finals.
And before the draw, Pique lifted the lid of the dressing room pranks that were played in the Red Devils' locker room.
He said that it was a day when he showed up for the training wearing a new shirt.
But before he knew it, that new shirt was resting on a punishment training dummy.
"I continue to make a few jokes in Barcelona, but much less than I did in Manchester, I think I could grow old. Even Jordi Alba is a good joker"
He told SportMail: "The high level of jokes is definitely something that I miss from my time in the UK.
"It was a lot of fun, ha ha, I love the English humor, the dark humor is brilliant.
"I continue to make a few jokes in Barcelona but much less than I did in Manchester, I think I could grow old, even Jordi Alba is a good joker.
"But nothing compares to United: when I arrived there one day I went to train with a new shirt that I thought was so pretty.
"The next thing I see when I step onto the training ground is one of those dummies you put into practice to practice with my shirt.
"It was rainy and muddy, the shirt ended as a disaster. I was 17, I will never forget (laughs)."
Pique flourished in Barcelona and has been considered one of the best defenders in the world for years.
The side of La Liga inspired by Lionel Messi is the favorite of the clash tonight.