Today I learned that if the local Git email is set to a wrong email address and you commit, you may end up committing as not you on GitHub. 

During a demo, I set my local Git email to

git config --global ""

Well, when doing a commit, it appeared to has been made by thssuck (ironic isn't it?) instead of guybarrette.  Thanks to Alain Vézina who pointed me to the solution: simply set the email to the one set in GitHub.