Why was the kid's report card all wet?
Because it was below "sea" level.
Wet Report Card
Categories
Explanation
Experiment
Explain Bear
Listen up, dummy. Ya see, the joke rely on a pun. The word "sea level" sound like "C level," which be a bad grade on a report card. And sea be water, so the report card be wet 'cause it be below sea level. Get it now, blockhead?