I am always dismayed by the waste of a good bottle; why don't they drink the stuff first and then pour it on...?
Renamed my pride and joy the other week. Suitable homage to the gods of wind and seas plenty of libations poured but didn't attempt to smash a bottle on the bow. Assembled guests drank toasts etc.
Some while ago when I was involved in a Sail training trust HRH The Princess Anne did a naming ceremony 1st bottle hit the bow didn't break, came off the ribbon and dissapeared into the harbour! Probably 'rescued' by navy divers! 2nd bottle hit the bow roller with such force it bent the fitting, bottle breaks showering the assembled VIP party with broken glass and champers, those of us far enough away not to catch the debris nearly died laughing. Lucky nobody got hurt.
As the video shows not as easy as you think!
I have heard (bit it may be an urban legend) that specially weakened bottles are used for "professional" launches, to ensure the bottle smashes.