The ornamental design of a waterpipe, substantially as shown and described.
FIG. 1 is a front perspective view of a water pipe in accordance with the present invention;
FIG. 2 is a rear perspective view thereof;
FIG. 3 is a right view thereof;
FIG. 4 is a top view thereof;
FIG. 5 is a left view thereof;
FIG. 6 is a bottom view thereof;
FIG. 7 is a rear view thereof; and,
FIG. 8 is a front view thereof.
The features shown in broken lines in the various Figures are for illustrating environmental structure and form no part of the claimed design. The article is not limited to the scale shown herein.