We had a funny one. A guy my DH worked with lived round the corner, we didn't know him and his wife well, but we did ask them round for a meal... all quite casual, it was a Sunday lunchtime and I did a farm shop quiche, cold chicken, new pots, salads etc. Nice weather, sat outside. All went well.
A few weeks later they asked us round for a BBQ. Arrived at their house at 12 noon, I took them some chocolates. Went into the garden, had a small glass of wine each and we sat. And sat. And sat. No sign of a barbecue, no one talking about it, and the longer it went on the more embarrassing it was. It got to 2.30 and I made faces at my DH, and we said... oh, we better be going. They said OK! And off we went!
Seriously strange! Never met up again, never found out the reason for that one