The windows on the metro rails I've been on were designed to be popped out without needing to break the glass first; the pane leaves the frame intact. On the stoppage I was on I just put my head back and caught some zzz's. No problem with the train, no action required, but we weren't going anywhere. Stuff happens, roll with it.
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Better is the Enemy of Good Enough.
Okay, what’s your point??