As a reminder, be sure to properly give content warnings and put sensitive subjects behind proper spoiler tags. It's for the mental health of not just your comrades, but yourself as well.
Here is a screenshot of where to find the spoiler button.
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Frequently bump them on things enough to cause discomfort. Only once in front of my parents. Made a ouch-noise and then worried they might ask why that would have hurt before remembering that people wouldn't ask that question. Still would be a funny way to come out.