ATTENZIONE AL VUOTO!!
frase resa popolare dall'uso nella Metropolitana di Londra. Fu introdotta nel 1969 per avvertire i passeggeri dello spazio che si viene creare in alcune stazioni tra la banchina e la porta del treno ed è diventata tanto famosa da essere spesso stampata anche su souvenir e gadget turistici londinesi.
‘’Once you are on a train platform, beware! Approaching trains sometimes disturb the large Gappe bats that roost in the tunnels. The Gappes were smuggled into London in the early 19th Century by French saboteurs and have proved impossible to exterminate. The announcement 'Mind the Gappe!' is a signal that you should grab your hair and look towards the ceiling. Very few people have ever been killed by Gappes, though, and they are considered only a minor drawback to an otherwise excellent means of transportation’’
