I don't know what I was doing wrong but I found this incredibly difficult to use the first time. I had to watch some youtube videos and even the other two people I was with couldn't get it (and no, we hadn't been drinking yet!) Once we figured it out it was pretty straightforward and kind of neat but to be honest I put it back in the drawer and I've never pulled it out since (and that must have been 9 months ago now). But, y'know - does what it says on the tin! Fun fathers day gift or for someone who drinks a lot of cans?!
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Could do with better instructions on the packaging.