so the spectator can see that they could have easily cut to any random cards

PARLOR or STAGE

This was David Penn's opening routine when he won The Magic Circle Close Up Magician of the Year and The IBM Close Up Competition

Except now

the milk disappears and so does the glass

Card College Volume 4 | Roberto Giobbi Christopher so the spectator can seeLearn such invaluable sleights as the invisible pass, the turnover and spread passes, the Christ twist, second and bottom deals, the Jinx change, the Green angle separation, the cut force, the dribble force, and much more including many tricks and routines by Mr. Giobbi himself. Some of the topics covered in Volume Four include: Forcing Techniques Card & Packet Reversals Advanced Passes Culling & Stacking Half Passes Tilt Sandwich Techniques More