GFI kitchen receptacle blew up
The load of a vacuum combined with the refrigerator was probably more than the wiring could handle. I state this because most vacuums are at the max of 15 amp circuits and now the refer kicks in another motor load with high in rush current. Depending on the wiring method it could be just loose connections that sparked but the gfci could in fact let the magic smoke out and this is an easy fix, turn the breaker off, buy a new gfci outlet, pull old outlet and install new oulet making sure to have the wires for line and load in the correct positions. Turn the breaker back on. Make sure the fridge is working , and use another outlet in the future.