can anyone solve this riddle?

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the one who makes it does`nt sell it
the one who buys it does`nt use it
and the one who uses it does`nt know they are using it

 

[JeR]

It is coffin, but I can make a coffin, sell it and use it.

 

[Justin]

peter griffin

 

[Annie]

a coffin!!!!!

 

[Jake]

coffin hope this helps