so i have a speech presentation about stem cell research in a few day, and my professor advised me to include a few jokes to lighten the mood. So if you have a funny stem cell jokes, let me have it.

Also, tell me if this one is funny:

One problem with embryonic stem cell is that they can change into unintended cell after injected into the body. For example, stem cell injects into the brain may becomes reproductive cell. If this happen to a guy, no one could accuse him of not thinking with his head again.