Consumerist reader Dan decided to McRib it for lunch today, so he drove through the drive-thru at a Chicago McDonald’s to pick one up. Unfortunately, what he got was a half-covered sandwich on a bun he can’t eat.

Here’s Dan:

When I opened it up I immediately noticed that someone replaced the delicious McRib bun with a Big Mac bun. I immediately called to find out what happened and I was told they ran out of McRib buns and were substituting the Big Mac bun. Some news they failed to tell me when I placed my order in the drive-thru.

Adds Dan, who can’t eat sesame seeds, “So much for lunch today. I guess I’ll have a candy bar and a Coke.”

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