Joke clarity at glance. The humor needs to land in under two seconds when someone walks past at a beach or aquarium. If a viewer has to read three lines of small text to get the gag, the design fails the funny-shark brief.
Sea-puppy vs apex-predator balance. Funny designs work when they commit to one register. Either the shark is rendered as a goofy cartoon (banana suit, leprechaun hat, laser beam on the forehead) or the menace stays intact and the punchline comes from a contrasting quote like "I like sharks and maybe 3 people."
Print legibility across shirt colors. Many shark designs default to navy or black for ocean atmosphere. We look at whether linework, white outlines, and tooth detail still read crisply when the color shifts, and flag the designs whose detail muddies on lighter heather backgrounds.
Gift-readiness across occasions. The strongest funny shark shirts double as Shark Awareness Day pieces, birthday gifts for a shark mom, beach vacation outfits, and aquarium-trip layers. A design locked to a single occasion, like St. Patrick's Day only, gets noted as seasonal in its block rather than year-round.
Niche-insider vs newcomer fit. Some quote designs ("It's a Shark Thing," "Crazy Shark Lady") read as identity-wear for someone already deep in the shark-fan community. Others, like rock-paper-scissors gags or pool-float crossovers, work for kids and casual ocean lovers. Each block calls out which audience the design suits.