Water suddenly draining away from a blocked toilet bowl
10 characters? Pile of cund.
The two best sounds are, in this order:
1. The first pour of a bottle of red. Glug-glug-glug. The sound made even better by the promise of the treat to come.
2. The deep crack of a sweetly timed cover drive. Followed swiftly by ripples of applause from the spectators.