Life is a roller coaster. There are ups; there are downs. There are hills; there are valleys, peaks, and so on.

The life of a startup is full of ups and downs, an emotional roller coaster ride that you can't quite imagine if you've spent your whole career in a corporation.

Everybody likes a roller coaster ride.

I'm on a roller coaster.

I don't want us to go on a roller-coaster,

There is nothing like the indignity of not fitting into a roller coaster.