If you are too young you really missed out being able to do this

Someone could make an app that detects a slam and hangs up the phone, then also sell a padded slam-receiver to replicate the experience. Or just use a pillow.

Edit: Found one. Unfortunately it no longer seems to be installable, probably because Google keeps fucking over independent app devs with new requirements. Source is here in case someone wants to see if they can build it.