Zechariah 9:15, "The Lord of hosts will protect them,
and they shall devour, and tread down the sling stones,
and they shall drink and roar as if drunk with wine,
and be full like a bowl,
drenched like the corners of the altar.
"But the passage pictures Israel drunk with another kind of wine: filled with the wine of Yahweh's Spirit, Israel would be bold, wild, untamed, boisterous in battle. This suggests one dimension of the symbolism of wine in the Lord's Supper: it loosens our inhibitions so that we wil fight the Lord's battles in a kind of drunken frenzy. If this sounds impious, how much more Psalm 78:65, where the Divine Warrior himself is described as a mighty man overcome with wine? Yahweh fights like Samson, but far more ferociously than Samson: He fights like a drunken Samson!"
Grape juice, we must admit, does not have the same effect.