I never did. No really, I'm honest! It never comes to my mind to use a straw like a diving tube before, I discovered it just now with this comic. Though I like chewing it or blowing bubbles inside a soda can.
I've made and tested under water, doesn't work u.u
I tried it under a small river back in my hometown. And it worked. Of course I had to put multiple of those straws together. It was hard to stay under the muddy water with just that though. Held out about 5~6 minutes. Didn't have a watch at the time. :p
firechikara said:
Though I like chewing it or blowing bubbles inside a soda can.
I blew bubbles in glass bottles and carton milk boxes. After all that, I would chew the straw till nothing can be sucked through anymore.