Stranger’s scribblings can enter your world at any time: via the jagged etchings on the back of a bathroom stall, a love note on a tattered dollar bill, or the half-completed crossword puzzle in the last in-flight magazine you flicked through. They are traces of people you will likely never meet, left only to remind you that someone else (literally) “was here.”

So, inspired by these talking paper towels, let’s leave our own paper trail.

Step 1. Determine what message/image you want to leave for a perfect stranger.
Step 2. Find a paper towel dispenser at your office, coffee shop, gas station, and start scribbling.
Step 3. Snap a picture. Post it here. Don’t embed.
Step 4. Wash your hands.

:: Image credit: Marc Johns