trick is to not dent the cap, pry it just enough to hear the gas escaping, then gently lift, rotating around the bottle if it's being stubborn.
when you put it back on, you should be able to hold it upside down without it popping back off
it won't hold the same as a fresh unopened one, but it won't come off that easily either
if you are careful when you pop the cap off, you can just put it back on with your hands, I used to do it at barbecues so wasps didn't get in my beer
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trick is to not dent the cap, pry it just enough to hear the gas escaping, then gently lift, rotating around the bottle if it's being stubborn.
when you put it back on, you should be able to hold it upside down without it popping back off
it won't hold the same as a fresh unopened one, but it won't come off that easily either
Hah! Nice :)