Originally Posted by Godkas

lol. Theres an episode of mythbusters that is about this. They grew vegetables on the roof of their building and play classical music and talk lovingly to the plants and in another green house they do nothing and the 3rd greenhouse they were blasting heavy metal yelling and screaming and cursing at the plants. The heavy metal veggies were the biggest and best tasting. So maybe theres something to it.

Originally Posted by Godkas

Another method i've heard of is crimping or damaging your top kola during flowering to make it expend energy repairing it and hence making the flowering buds bigger.