The challenges I mean. Some of the unexpected stuff that happens on their adventures just seems to good to be true.
Like when Richard and James push Jeremy's 3-story mobile home over a cliff, then he's just sitting there unaware of it all, does he actually known what's happening?
Still hilarious though.
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Most of the time they don't script however for safety reasons i think some such as the caravan fires and the campavan one was scripted. Although it is likely that they planned it but didn't tell jeremy that they were going to do it.