$100k flyer on market crash?

Just looking for opinions. If you had $100k to take a flyer that the market will crash, what investment instrument would you use? I’ve done pretty well with the set it and forget it and perpetual investing over the last 25 years. I really want to take a gamble. This would be off the books, I won’t miss it. I’m fine with the same set and forget mentality for this money. I’ve been looking at inverse etfs which they say are very risky if held long, which is exactly the type of risk I’m looking for.