The kills should be the fun part. Instead they are where Chum capsizes. The shark balloons and shrinks from one cut to the next, sometimes dwarfing the boat, sometimes barely bigger than a dolphin, and never the same beast twice. When your monster cannot hold a consistent size for ninety seconds, the audience stops fearing it and starts charting its diet. Even Deep Water, another modest aquatic thriller from this same stretch of the calendar, at least respected its own rules. Here, continuity is treated like an optional upgrade nobody paid for.

The cast cannot bail the water out fast enough. Eve squints through her dialogue like she is reading it off the horizon, Cole plays the groom as a man slowly realizing his agent owes him an apology, and Rachinda (Sarah Siadat, Pretty Little Liars: The Perfectionists) is stranded with a character who exists only to be next. No one is bad in an interesting way. They are bad in the way of people who knew the boat was sinking and clocked in anyway.

It does not help that the movie cannot decide what it wants to be. The influencer hangers-on suggest a satire that never arrives, the wedding angle hints at a black comedy the film is too timid to commit to, and the gore gestures at a hard-R creature feature without ever earning the rating. Pick a lane. Chum idles in all three and arrives at none, which leaves long stretches where nothing is funny, nothing is scary, and nothing is happening. A movie about a shark eating a wedding party should never be boring, and yet here we are, checking the runtime while the cast treads water.