The ornamental design for a watergun, as shown and described.
FIG. 1 is a perspective view of a water gun showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is an enlarged partial view of the grip portion taken from left side of the water gun in FIG. 1.
The broken lines in the drawings depict portions of the water gun that form no part of the claimed design. The dash-dot broken lines represent the boundaries of the enlarged partial views of FIG. 8 and form no part of the claimed design.