Show an elegant long stem wine glass, fill it with water, cover it with a coaster and turn it upside down. Remove your hand and the coaster, and the water remain suspended inside the glass! At your command, the water falls out!

They all shout, "Do it again! Do it again!" So you do it again, this time with real red wine! (or any liquid)

You fill the glass with red wine, cover it with a coaster and turn it upside down. Remove the coaster, and the red wine can be clearly seen to remain suspended inside the glass! Only at your command, the wine falls out! (into a bucket below unless you want to make a mess)

From the creator of the original Silk Thru Phone effect and Tenyo magician Jeimin, here is another winner for professional workers.