I don't think anyone should take precautions. You got pranked? Laugh! It's funny! I get bored of reading April Fool's pranks on websites because the comments are always full of "This is a prank! I caught you! Look at me, I am so smart to foil your plans!" from the April Fool's Police or whatever. It's like, alright, well done, do you want a statue dedicated in your honour or will this medal suffice? If you figured it out, great, play along and have a laugh with it.