Riddle: What hurts when you hit it?

[KolKol]

I heard it, but I don't know what the answer to it is. Remember, I am brain dead towards any and all riddles.

 

[Axeloblivion]

A pen is.(This is an actual answer, no need to report LOL)

 

[RichBottlesJre]

Rhianna

 

[MeikoSakine]

a bubble

 

[ThirdEarthAge]

Funny bone.

 

[JesseB]

Here's a hint: It feels good when you suck on it!