I've accidentally removed one of my special obstacles (the Spike-Y Cactus) and there was no way for me to stop the process since the WiFi bar appeared and I couldn't do anything. When the game reloaded, my Cactus was gone and I'll never know what I got as a little reward (gems, gold...), and I only had one of them. It would be awesome to have a "Special Obstacle Refund" option in the game as this has happened too many times (not only to me). Obviously the player (and/or me) has to pay off a little gold/elixir to get back the obstacle (in exchange)