This is like telling a man wrestling four alligators not to ignore that 30-foot anaconda that just slipped into the pond.
One moment of weakness, and the alligators can eat you alive.
People swim into pool walls, people swim into each other, and, in certain parts of the U.S., people swim into alligators.
1560s, lagarto (modern form attested from 1620s, with excrescent -r as in tater, feller, etc.), a corruption of Spanish el lagarto (de Indias) "the lizard (of the Indies)," from Latin lacertus (see lizard). Alligarter was an early variant. The slang meaning "non-playing devotee of swing music" is attested from 1936; the phrase see you later, alligator is from a 1956 song title.