[ WP ] Write the most elaborate , over-dramatic , and exciting story you can think of that all just turns out to be a set-up for a pun so horrible I 'll want to punch you

The surgery was happening tomorrow. I fell into the correct blood group and can help these people. The doctors said it was a miracle they found me but im just glad to be helping out. 
 
 The doctor has arrived but he looks concerned. I ask him whats wrong but he turns away. His voice is low and shaking `` we made a mistake'' 
 
 `` What do you mean!'' I was afraid, I thought I could help. 
 
 `` The blood! Your blood! We made a mistake!'' The doctor slams his fist down on the desk, he cant hold back his tears. 
 
 I remain silent, and wait for an explanation. 
 
 `` We thought you had type-A blood, but it was a type-O''
