Last week I was on an AA flight from PHX to MIA and had an odd experience. After landing we taxied off the runway but still carrying a lot of power. You could hear the engines still spooled up and it felt like the pilot was on the brakes trying to keep it under control. We taxied straight into the gate without waiting to be marshaled in. When we were a few yards from the gate the front nosewheel skidded sideways before the pilot hit the brakes hard. After stopping the engines were still spooled up then he killed the engines. You could tell the ground crew was not prepared for the arrival and they were scrambling around. After a few minutes the tug was hooked up and they pushed the plane back a few feet. Some of the gate staff were taking photos. Is it possible for the throttles to get stuck leaving the plane under power? I’ve been on hundreds of commercial flights and have never experienced an arrival like this one. Thoughts?