Allergan PLC shares plunged 16% today after the U.S. Treasury Department late Monday announced new rules to curb corporate tax inversion that could complicate the Botox maker’s takeover by drug giant Pfizer Inc. Well honestly I'm not a fan of this deal between Pfizer and Allergan, although I'm a big fan and long-term investor of Pfizer. Looks like Wall Street is against this deal too - Pfizer shares are up 2.1%. I will not shed a single tear if this deal does not happen :) Because Pfizer shares will only gain from this. Pfizer, please, stay in US)