There is no such thing as a fun disease, of course, and there are some that are very interesting in a more "WTF?" way. Although malnourishment, using medications and migraines are common everyday things, these might sometimes lead to such diseases that are so unique that we couldn't imagine them even if we wanted to.
There are also some psychiatric and genetic diseases that are just very, very bad luck.
We hope that cures will be found as soon as possible and people won't have to suffer from such diseases.
Y'all take care of yourselves!