I can't remember the race ( it may not even have been Le Mans ) but I always rather enjoyed the story of when the late Mike Hailwood was racing for John Wyer. The car DNF'd and when it was towed back after the race, the mechanics found a detached ignition wire and had the car running again within minutes.
'Mike' said a tetchy Wyer, 'Couldn't you have at least checked around under the engine bonnet ?'
'Check around ?
Check around ? ' fumed Hailwood, 'I don't even know how to
open the ****** bonnet !'......