No you should be lucky those are the only "bad" social habits you have. If you think trailing off or mumbling is bad, try stuttering on every single word or laughing way too loud like someone who's actually socially awkward.
A black panther is typically a melanistic color variant of any Panthera species. Black panthers in Asia and Africa are leopards (Panthera pardus). Black panthers in the Americas are black jaguars (Panthera onca).