Not noises but something equally worrying, on a CX midnight departure out of HKG for LHR, I was travelling with the wife in the first row of economy and during the short taxy to the runway my wife and I looked at each other at the same time and mimed "burning smell".
At about the same time, a cabin crew member was passing and I alerted her. She could also smell it and called the FD right away. Quick as lightning, the FO was downstairs and confirmed it wasn't in our imagination. We held for a short while and the smell did dissipate and we got underway with strict instructions to keep our noses tuned. Nothing further fortunately.
We probably missed a slot because of it but nobody was complaining. I'm sure a fire must be all crew's worst nightmare.