Finish the sentence from above in the comments! The "sinking feeling" could be anything. Your handcar partner bailed? You realize that taco you had for lunch isn't agreeing with your stomach? You decide!
About this creation
The Handcar. Try to find the CHIMA part!(s)
Cow skull. CHIMA strikes again!
Rail technique: you may use it as long as you give credit were credit is due!
Hope You Liked, and Keep on Building!