http://pipeline.corante.com/archives/things_i_wont_work_with/
I don't know jack about chemistry other than it fascinates me. His blog has a section called "Things I Won't Work With" and it is hilarious.
A favorite entry: http://pipeline.corante.com/archives/2010/02/23/things_i_wont_work_with_dioxygen_difluoride.php
"The paper goes on to react FOOF with everything else you wouldn't react it with: ammonia ("vigorous", this at 100K), water ice (explosion, natch), chlorine ("violent explosion", so he added it more slowly the second time), red phosphorus (not good), bromine fluoride, chlorine trifluoride (say what?), perchloryl fluoride (!), tetrafluorohydrazine (how on Earth. . .), and on, and on. "
And this one: http://pipeline.corante.com/archives/2008/02/26/sand_wont_save_you_this_time.php
"If, however, this coat is melted or scrubbed off, and has no chance to reform, the operator is confronted with the problem of coping with a metal-fluorine fire. For dealing with this situation, I have always recommended a good pair of running shoes.