FIG. 1 illustrates a top left perspective view of the roller coaster hat, with environment shown in phantom line, showing my new and ornamental design;

FIG. 2 illustrates a front elevation view thereof;

FIG. 3 illustrates a rear elevation view thereof;

FIG. 4 illustrates a right-side elevation view thereof; and,

FIG. 5 illustrates a left-side view therof.

The human figure shown in uniformly-segmented broken lines in FIG. 1 illustrates the claimed design in use and forms no part of the claim. The uniformly-segmented lines in FIGS. 3-5 illustrate unclaimed features of the design.

The stipling in the drawings represents shading and forms no part of the claimed design.