Lay
Used by idiots in place of lieu of "lie" -- as in lying down, not telling an untruth. Confusion arises from the fact that the preterit of "lie" is "lay".

Infinitive: Lie (to lie down, intransitive)
Preterit: Lay
Past Participle: Lain

Infinitive: Lie (to tell an untruth, intransitive)
Preterit: Lied
Past Participle: Lied

Infinitive: Lay (transitive)
Preterit: Laid
Past Participle: Laid
Idiot usage: I love to lay on the beach.

Correct usage: I love to lie on the beach.