Okay so my two almost three year old son is pretty much potty trained like he knows how to use the…

Okay so my two almost three year old son is pretty much potty trained like he knows how to use the toilet and where to go if he has to but he pees on the floor and thinks it's funny. What would be an appropriate way to handle this? Because apparently talking to him and letting him know he needs to use the toilet isn't helping.