Ah, Sesame Street – who among us doesn’t long for the idyllic setting of Big Bird, Snuffalopogus, and Cookie Monster? Sometimes it’s easy to slip away and imagine sitting on the stoop, sharing a juice box with your buds Bert, Ernie, and Grover after a hard day at the grind; even if rote memorization of multiplication tables are far in our rear view mirror. RCKNDY owner David Dennis, though, is living proof that Sesame Street…