Well if you keep treating us like morons don't be so surprised we get flustered and occasionally lost.
From observation folk don't need excuses!
A different mode of transport
Euston Station, departure board shows two trains to two different destinations on adjacent platforms.
Tickets checked as you go down the ramp to platforms, inspectors directing folk to the correct train.
On the train doors in cheerful yellow LED's the train's destination.
Four folk get on to first class (business suits etc. I put that in to suggest they may be reasonably intelligent) and begin arguing that some other people are sat in their seats. Train manager called who points out that the four that have just got on are on the wrong train and theirs has just left.
No security checks, departure board correct, tickets checked, directed to the correct train and signs on every door showing destination.
Could they use your excuse?