Here are 10 things you may not know about Reese’s Peanut Butter Cups.

Reese’s has become synonymous with chocolate-y peanut butter treats. In addition to being delicious, they’re also quite fascinating.

Here are 10 things you may not know about them.

Number 10. Reese’s Pieces weren’t the first choice snack for E.T. If Spielberg had gotten what he really wanted, the beloved extra-terrestrial would have been chowing down on M&Ms. The company that makes them turned the offer down, paving the way for the pieces rise to fame.

Number 9. When it comes to holidays, they’ve got you covered. For all 4 of the big sweets holidays – Christmas, Halloween, Easter, and Valentine’s Day – they offer specially shaped candy. Bells, pumpkins, eggs, and hearts are among the forms often available.

Number 8. Reese’s Peanut Butter Cups are a good source of protein. A standard serving packs 5 grams of it, about the equivalent of a handful of almonds or a half a cup of chickpeas.

Number 7. Half-pound cu