“What is this bubbling out of the ground in my yard? Purplish metallic gooey inside.”

Answer: “Carpenter here, that looks all the world to me like expanding foam. The manufacturers like to color them for brand recognition or purpose identification. All the signs are there. The even coloration, the outer skin that formed, and the familiar random expansion pattern.”

Also read: Put your observation skills to the test and see if you can find the hidden key in under 7 seconds! Only those with laser-sharp eyes will succeed.