Black Friday?It's just as well no one has any money for holiday shopping this year: apparently it'll kill you. According to a new study, battling holiday crowds sped up heart rates and "increased blood pressure to dangerous levels in 50 per cent of shoppers," which in turn leads to fun stuff like hypertension and heart disease. It should be said that the study asked the 15 men and 15 women "to purchase a variety of gifts within 75 minutes," presumably somewhere crowded, which is like worst possible case scenario. The men's stress levels doubled; the women's - who probably put more thought into their gifts - tripled. No word yet on the dangerous carpal-tunnel effects of online shopping. [Daily Mail]