If it's a forceful opening and you're not holding the top tightly, then I imagine the top could launch upwards. I know from experience this can also happen if you put just a bit of boiling water in and seal it. The air expands under heat and will push the top out whilst you're unscrewing. A version of this top comes with a metal spoon & raised holder built in, providing some edges to hit you with and an extra projectile.
I've been intensively learning German for a year and once or twice a week in dreams I have brief dialogues with the locals. Very useful as additional speaking practice :)
Back when I was younger and earned minimum wage, whenever I thought about buying something I'd run the calculation of how many hours I would need to work to pay for it. That helped me save quite a bit.
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