I recently carried out my own study entitled "Breaking your leg a week before you are meant to be flying out to the Cricket World Cup in the Caribbean is a really stupid idea"
11 people took part - 1 had the real break (myself) while 10 mates took the placebo version (ie. no broken leg) and as I type are winging over the skies to the West Indies.

Findings are pretty conclusive and result not just in feelings of stupidity but also mild depression at the thought of having to now work the next 5 weeks and unreasonable bitterness towards placebo participants at the holiday they are on that was oganised by leg breakee....