Well, I wouldn’t want to see the rocket still going on the ground...
Imagine the thing rocketing off along the ground into the nearest town!
That’s known as a landshark!
Here are some good examples.
https://www.youtube.com/watch?v=yOs0Gn8rIcE
https://www.youtube.com/watch?v=s46oPVwJZV8
https://www.youtube.com/watch?v=bA1aWcWPA4U