Because you suck it up
Air pressure
When you suck on the straw, the pressure inside your mouth is less than the outside air pressure. Because of the imbalance, the outside pressure pushes the milkshake down the glass, up the straw and into your mouth.
To enjoy a thick milkshake with a milkshake straw efficiently, try tilting the cup slightly and using a spoon to help scoop up the thick shake while sipping through the straw. This method allows you to enjoy the milkshake without struggling to get it through the straw.
The part of the milkshake that is in the upper portion of the straw is exposed to a warmer environment than the bottom of the straw. Since the bottom remains cold longer it continues to plug the lower end of the straw while the upper portion of milkshake begins to expand in volume as it thaws. Since the bottom is plugged and the capacity of the straw remains constant, the increased volume of fluid spills out of the top of the straw.
Milkshake straws are larger in diameter than soft drink straws. Since milkshakes are thick, they are very hard to drink with a small straw, thus the increased diameter of the straw makes it easier to drink.
They were shaking it up.
Some creative ways to use a candy straw in a drink or dessert recipe include using it as a stirrer for a milkshake, using it as a garnish for a cocktail, or using it as a fun and edible straw for a smoothie or milkshake.
by putting a screw in a paper straw and pulled it with dental floss to bend it for his daughter to drink a milkshake
an explosive eruption
The power of suction is what is demonstrated by water moving up a straw. When you suck through a straw, the water has nowhere to go but up.
she was coaght drinking a water melon milk shake with a bendey straw!
When we suck the straw, we create a pressure within the straw to go against gravity. So the straw pulls up the lemonade because of the force we create through sucking.