In the never ending quest to find new ways to tinker with our beers and produce better flavors, it's been promoted that to produce more ester and phenol characters in a brew, one should pitch less yeast. 

The theory is pretty simple - esters and phenols can be by product of poor yeast health or a stressful fermentation. This gets pounded into your head during BJCP training and is one of the reasons brewers have been recommended to make starters to ensure they have plenty of healthy yeast at the ready to tackle the job.