Walt: If that's true, if you don't know who I am, then maybe your best course would be to tread lightly.

from Breaking Bad (Ft. Bryan Cranston & Peter Gould) – Blood Money on Rap Genius

Meaning

TREAD LIGHTLY

Walt purposely leaves the meaning of “tread lightly” ambiguous. It can be interpreted as asking Hank not to rush things, since just coming out and accusing Walt of cooking meth could tear their entire family apart. Or, more sinisterly, he could be warning Hank that if he really doesn’t know about the full extent of Walt’s crimes then he better not mess with him; unless he wants to end up in a barrel filled with hydrofluoric acid.

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