The ornamental design for a partyhat, as shown and described.
FIG. 1 is a perspective view of a party hat in accordance with my new design;
FIG. 2 is a front elevational view of the party hat of FIG. 1 shown in a flat condition, the opposite side being a mirror image of the front view;
FIG. 3 is a top plan view of FIG. 2;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is an end view thereof; and,
FIG. 6 is an end view of the opposite end thereof.
The indicia, the balloons, and the small circular motifs on each of the prongs rendered in broken lines in FIGS. 1 and 2 illustrate environmental matter and form no part of the claimed design.