A new advertising campaign is promoting a straw that lets you sip two flavors of a shake at once.
McDonald's said a whole team of engineers designed the new straw.
PUTTING 'THE STRAW' TO THE TEST
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It was created for the shamrock shake - which has a layer of chocolate on the bottom and mint on the top, so you need "the straw" to taste both flavors.
"The straw" debuted on Facebook Live Wednesday.