Milk jug has a mind of it's own?!
I was sitting and eating cereal and the cap popped right off the milk jug! I wasn't even touching it! What happened!?Www@FoodAQ@Com
Answers:
when you poured the milk out, the sides of the jug went in a little due to air displacement, and you put the cap on before all the air returned into the jug!. then the room temp caused the plastic to expand a bit, and the cap popped off to let the air back in!.Www@FoodAQ@Com
Or maybe when you put the cap back on you squished the neck of the jug slightly and put the cap on a bit too tight; when the neck expanded back to its normal size the cap would not fit in its position anymore and would pop off the bottle!.Www@FoodAQ@Com