As Carrie ascends to the stage to sit on the throne and be crowned, Chris dumps pig's blood all over her and Tommy from two metal buckets above the stage as revenge for being banned from the prom.
As Carrie ascends to the stage to sit on the throne and be crowned, everyone begins singing the school song as tradition. This gives a hidden Chris her cue to pull a rope cord that releases two metal buckets filled with pig's blood above the stage as revenge for being banned from the prom.