In 1E, due to the vagaries of initiative, a huge scorpion-thing attacked a paladin before he could heal himself. Normally both pincers would hit at the same moment, however the paladin's player argued that it was unlikely that two 8' long pincers could attack his 6' tall character at once. The DM (me) agreed, and the second pincer came a segment later than the first - allowing the paladin to heal himself before the second pincer's damage was assessed, which saved the paladin's life.