The ornamental design for a noveltyfan, as shown and described.
FIG. 1 is a perspective view of a novelty fan showing our new design;
FIG. 2 is a side elevational view thereof;
FIG. 3 is a front elevational view thereof; and,
FIG. 4 is a rear elevational view thereof.
The structural features depicted by broken lines has been shown for the purpose of ilustrating portions of the novelty fan that form no part of the claimed design.