I May Be Running Out of Thoughts

I'm always in fear that I will run out of sentences to write, and that day may be looming close -- I was driving on Route 18 on Monday and I saw a truck with giant spike lug nuts and thought: are those really necessary?  and then my next thought was: I should write a sentence about how trucks are already intimidating enough and don't need any extra-intimidating accessories, but you can see where this is going . . . I already wrote that sentence, two years ago, and while I'm proud of the fact that I had the perspicacity to check and see if I wrote that sentence previously, I'm worried that the day will come when I won't think to do this (and what's even worse, is that most likely, no one will notice).