Took my car for an early morning run in the mountains near me. Was taking it very easy as there are a tonne of roos around in the morning. Anyway the drive took about 1 hour then i got back to town and went through the maccas drive through for brekky.
After sitting in the drive through for about a minute smoke just started pouring out of the exhaust, it filled the drive through up. I got my food, pulled out and parked up, revved the car a couple of times and it was all better. Drove to work and left it idling for a while to try and re-create it but it didn't happen again.
Sound like turbo seal ya?