Van Helsing in the novel has many due to his unusual mannerisms:
John Seward: I am satisfied that Lucy's body is not in that coffin; but only proves one thing. Van Helsing: And what is that, friend John? Seward: That it is not there. Van Helsing: That is good logic, so far as it goes.
Seward dictating his notes on Renfield.
Seward: I seemed to wish to keep him at the point of madness, a thing I would avoid with patients as I would the mouth of hell. Memorandum, under what circumstances would I not avoid the pit of hell?