Sea Pipe Statue

The Sea Pipe Statue is a boss in Mario & Luigi: Bowser's Inside Story. It is a fountain statue that Fawful brought to life. On the statue is a Stone Blooper, which comes to life and does the attacking. It can hide inside one of the pipes attached to the statue, shooting itself at Bowser, who must counter attack with a punch. At one point, Bowser can suck in the Blooper so Mario and Luigi can fight it. In the battle with Mario and Luigi, the Blooper may fly toward them for a tackle attack. Another one of its attacks is embedding itself in the fleshy floor of the battlefield and spinning quickly, injuring Bowser. This attack is unblockable. Soon, the Blooper will rocket out through Bowser's mouth and crash into its statue. Bowser can then attack without fear of retaliation for several turns.

Soon, the Sea Pipe Statue and Stone Blooper are defeated and the fountain statue becomes a normal fountain, which Bowser can use to help Mario and Luigi in his stomach and to allow them access to the Pump Works.

Trivia

 * This is the only enemy that damages Bowser while fighting Mario and Luigi inside Bowser with no effect other than damaging Bowser.