Bob

Schroedingers: Seven stud, high-low, fifth card is common. Aces round the corner; the common card is the high/low instead of the ace.

Less concisely: this is dealt and played mostly like Seven Card Stud. However, instead of dealing a fifth card to each player (what would normally be the third face-up card), it is revealed as a common card for the entire table. That rank is now "high", and the number just above it is now the "low" -- so if the common card was a 9, then the high straight is now 9-8-7-6-5, and 10s are now the low card. To make this work, Aces are "round the corner", so a straight can pass through the Ace. (That is, 3-2-A-K-Q is a legal straight.)

Variation: Amusingly horrible if played as an Omaha Eights.

Variation: Try as high only, because figuring the lie is a nuisance.