Snap a picture of yourself on every commit.
Probably Mac OS X only, I haven't looked into others.
$ brew install imagesnap
$ git config --global init.templatedir '~/.git_template'
$ chmod +x post-commit
$ mkdir -p .git_template/hooks
$ mv post-commit .git_template/hooks/post-commit
$(date -j -f "%a %b %d %T %Z %Y" "
date
" "+%s") doesn't quite work for me, I changed to $(date +%Y-%m-%d-%H%M%S) instead.And .gitshots folder need to be created manually or there will be an error.