Blacjack dealer has a rare hand question

[pokerscab1]

Was dealing last night on table, 6 deck shoe. I turned up a four, flipped over a 4, then pulled three more fours, much to MY delight, but to the players dismay. (I thought it was neat.)
I've been dealing for 4 years and have only seen this one time. Was wondering what the odds of dealing this hand are.