As previously mentioned for the Goro's Lair Stage Fatality, you can see your victim slide off of the spikes, and hear Dan Forden say "TOASTY!!", by holding Down+BL. However, our Chicago Correspondent, kn0wledge, has confirmed that these two effects can also be done seperately: Hold BL individually after knocking your opponent up to the ceiling spikes to hear "TOASTY!!", or Down individually to see the victim slide down from it