Random fun question

What random common house item(s) have you found that cause the most amount of pain with the least amount of effort?

What made me think of this question is I randomly decided I wanted an ache to wake me up a bit so I grabbed my nuts in my Left hand (so they stick out of my fist resting on my thumb and pointer finger... We all know the hold lol) grabbed my PS4 controller and hit my nuts with the handle, instead of being a slight ache it sent a jolt of pain to my stomach 😅, no complaints just surprised.