...my left nut plays Jingle Bells when you pull it.
Both statements are based on scientific research and are as believable theories as each other, based on the research carried out.
This Dear readers, is the basis for their 'findings' (http://www.news-medical.net/?id=48210):
Since the 1950s, the incidence of the two main cellular subtypes of testicular cancer, nonseminoma and seminoma - the more common, slower growing kind that strikes men in their 30s and 40s - has increased by 3 percent to 6 percent per year in the U.S., Canada, Europe, Australia and New Zealand. During the same time period, marijuana use in North America, Europe and Australia has risen accordingly, which is one of several factors that led the researchers to hypothesize a potential association.
Mmmm, I'd venture to suggest that so has fatty food consumption, driving, alcohol intake and a plethora of other increases in 'things'.
This was the testing method (http://www.cancerpage.com/news/article.asp?id=13294):
To investigate, the researchers assessed marijuana use in 369 men who were diagnosed with TGCT from January 1999 to January 2006 in three counties in Washington State and compared it with that of 979 age-matched controls
Fuck. Based on their hypothesis, I think maybe even my right nut will play something too. After all, the incidence of singing Bass has increased substantially in past years. Why not singing Testes?