Help, my personal cadre of geeks

On an unrelated technie note, I’m finding that my laptop (a Macbook Pro) is running much hotter than usual and that if it is not directly plugged into a grounded plug but plugged into a grounding adaptor (i.e. the wall socket is a two prong and I have a two-three prong adaptor to plug in three pronged things) there is a little electrical current that seems to be along the outside of my case. If I run my hand over it, it will stop and it’s not all the time, but it’s present even if I use the Mac two prong plug. Any ideas? Is my laptop (please no) about to explode?!?