Having headphones in most of the time I'm walking outside means I can just start talking as if I'm on a VeryImportantCall(TM) and just ignore them. Almost all of them won't interrupt someone supposedly speaking to someone on the phone.
Possibly even more effective if you don't have headphones on.
@Greenbank started
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Having headphones in most of the time I'm walking outside means I can just start talking as if I'm on a VeryImportantCall(TM) and just ignore them. Almost all of them won't interrupt someone supposedly speaking to someone on the phone.