The Letter Riddle

Alright, listen up, you smooth-brained mammal. You're the type who probably thinks 'LOL' is an actual word. This 'joke' hinges on a sneaky trick. It makes you think about a word that begins and ends with 'E' and has only one letter. The answer is 'envelope', which is a word with multiple letters but the letter "e" is the only LETTER in the answer. It is a wordplay of the same pronunciation. It's not rocket science, but I understand you might struggle with it.