Abstract: A drinking straw includes a straw, a fixed collar, and a moveable collar. The straw has an upper part having an open upper end for reception in the mouth of a user, a lower part having an open lower end for immersion in a liquid to be sucked through the straw by the user, a convoluted part provided between the upper and lower parts, a passageway extending through the fix collar and a side wall of the lower part of the straw, and a moveable collar for selectively closing and opening the passageway, whereby when the passageway is in an opening position inside the moveable collar, air is sucked into the straw through the passageway when liquid is sucked through the straw by the user, thereby to create vibrations in the convoluted part of the straw.