I remember an earworm generated by the instruction 'TL sp Knockando' on a ride on Speyside. That led to a conversation on PBP2011. There followed another conversation 800kms later on, complaining about a 'Family Man' earworm.
Planting ideas which only make sense as the ride unfolds can be fun, but many might say, 'I can't go for that'.
I suspect if someone took spoken route instructions for the Snow Roads from a talkative companion they may suggest after crossing Cairn O' Mounth and discovering that neither Finzean or Strachan are on the sign posts that the companion is a Farquhar and should get lost, but that would involve a right turn at Corgaff rather than the required left.