I like this postcard from the American workplace. Young lady is standing in what looks like a bog-standard photocopy room or supply area, showing off a nice set of caning stripes and holding a sign: “I used to have an attitude problem.”
2015 update: this post used to link to a Tumblr post that’s now gone, and I couldn’t find the picture anywhere except in postage-stamp size from a video box cover:
Thanks to Chross (in the comments) for identifying this as an image from British Spanking Volume 2. I was able to find the other three videos in that series at my usual streaming source, but not the volume in question.