I know the ad says they'll fit up to a 20" mattress, but that's like me saying I still fit into my t-shirts from high school: technically true, but it won't be pretty.
Madness string 112243
Machinists like to say if you leave the key in the lathe chuck, it can fly out and give you summer teeth. Some're here, some're way over there, and some're nowhere to be found.