Will has this train table out in the garage. A lot of times when he can't play outside he'll go and play with this. One day he was being especially quiet out there and had been playing for a good 15 minutes. All warning signs. I quickly went to check on him and asked if he was OK from across the garage. He froze, smiled really big and said yes! He held his smile and our eye contact. Hmmm, I needed to investigate further. I went over to see that he had dumped most of the bag of grass seed on his train table to make a construction worksite with it.