How to deal with internet scammers and Phishers?

[NM_Shooter]

I've got a kayak for sale locally.  As luck would have it, it sold almost immediately to a nice young man who lives elsewhere.  Odd though... he wants to send me a check for more than I am asking for the boat, and for me to wire the difference back to him.   

So.... how do I best make life a bit painful for this person?  I'd sort of like to get a check as a trophy of sorts.  Or is it dangerous to interact at all?

Maybe send them the phone number and address of the local police station to mail their check to?

[MountainDon]

It would be fun to play with them, but you'd be giving up personal info, MTL. I like the idea of sending it to the police. How about asking the local gendarmes? Out of state buyer... FBI??     

[MountainDon]

Tell him to Western Union the money to you and you'll do the same with the 'change'.

[phalynx]

Here is my favorite story involving play with scammers.  This is extremely long and well developed but actually scammed the scammer.  Take a few minutes to read through.
http://www.419eater.com/html/joe_eboh.htm