Actually it wasn’t an exploding one, you just can’t blow the candles out. I don’t know how to post a giff but here is what it is only in a giff he is blowing and blowing.
https://www.google.com/search?q=toilet+paper+cake+gif&rlz=1C1BLWA_enUS583US651&tbm=isch&source=iu&ictx=1&fir=ZZw9qHeB_2bR0M%252CoEu96eOkqdtW3M%252C_&vet=1&usg=AI4_-kTsi-m4fyR1fy0NISZHiN6BVMxvCg&sa=X&ved=2ahUKEwi_7_HI3abtAhXfRDABHcYkAr0Q9QF6BAgBEEc&biw=683&bih=328
LOL, your son has his mama’s great sense of humor!