Kolache Puns

So I brought in kolaches to the office this morning for breakfast. For those that don't know, they're basically bread rolls filled with egg, cheese and whatever else you want. One of my coworkers started talking about how they reminded him of some kind of cake "with M&Ms in it."

Except English isn't his first language, so he was saying it a little weird.

Him: "You can't bake a cake with M&M in it."

Me: "'Cause you'd kill him."

There was absolutely no reaction whatsoever, so I can't tell if people were just ignoring my awful joke or if just nobody heard me.