What would you do in this situation?

You started work at a new place a year ago. Every week there is a lecture series with a new person’s face on a poster. You’ve noticed that about 50% of the time that picture will be defaced in some way on the flyer in the elevator. If it is a male picture the eyes and teeth will be poked out with the push pins that are provided on that board. If it is a female picture it will have hearts drawn around the picture. You have no idea who is doing it.

Do you do something/say something or do you just go about your day.