Too soon?
Allow me-
'The eternal flame has been extinguished a few times by accident. On December 10, 1963, a group of Catholic schoolchildren were sprinkling the temporary flame with holy water. The cap came off the bottle and water poured onto the flame, putting it out. A cemetery official quickly relit the flame by hand.[67] In August 1967, an exceptionally heavy rain extinguished the permanent flame. A nearby electrical transformer flooded as well, depriving the spark igniter of power and preventing the flame from being relit'
http://en.m.wikipedia.org/wiki/John_F._Kennedy_Eternal_Flame