When a pig farmer sued a hot air balloon firm, he needed to prove he wasn’t telling porkies.

如果一个养猪的农民想要状告热气球公司，那么他得证明自己不是在胡说八道。

Luckily for Dan Gilbank, he had maths professor, the laws of trigonometry, a lucky photograph and a golfer’s laser rangefinder to back up his case.