I actually enjoy these sorts of obstacles. Having to change route has often led me into wonderful places, and met wonderful people, that I would otherwise have missed. The most extreme example was in Angola where I'd, inadvertently and unknowingly, strayed into the grounds of an open air prison. From being questioned at gun point I ended up staying the night (voluntarily) in a cell with complimentary refreshments. All communications were by reference to a English/Portuguese phrasebook and hand signals 😉