I was watching Top Gear last night and Richard Hammond was (supposedly) trapped on a mountain in British Columbia and had to "survive".
At one point he laid a snare for rabbits on a track and said:
The instruction on this say I need to bait this with my own pee (continues to pee on snare)
(or words to that effect).
I guess this is just a slightly silly joke, but is this simply Top Gear making a joke or is there some truth in this practice?