I’ll never forget the day in elementary school where I saw a kid casually put his mouth directly on the spout. Then it dawned on me: “There are probably others like him.”
Sounds like you were lucky then, because I remember elementary school too and probably every 5th kid did this on the regular. And have you ever dealt with the really young kids <6 years old? They'll ask for a boost, suck that spout like a teat, and let everything that they don't swallow run down their neck soaking their shirt, but they'll be hydrated.
No so much lucky - I’m just a kid that grew up with a diagnosed anxiety disorder. Good thing about an anxiety disorder is that you identify risks before everyone else. It’s like a shitty super power.