I was going to get a brain transplant, but I changed my mind.

Behind the Groan

Changing the Mind in Question

“Changed my mind” usually means reversing a decision. Because the decision concerns a brain transplant, the phrase can also suggest replacing the speaker's mind itself. The joke works best as a quick, matter-of-fact one-liner. Pause briefly after the transplant plan, then let the familiar explanation end the thought before listeners notice that it can describe the procedure too.