Ok I posted about this last night when I was all of a tither, tired and in shock. So please excuse me posting the same thing again but I just want honest opinions on whether you reckon he was being serious or not.
Basically, the backstory is that boyfriend and I have been planning a holiday to california. Within this trip we hope to stay in Vegas for 3 nights.
Last night, he took me out for dinner and during conversation about this trip he suddenly said "shall we go and get married?" 
caught me completely off guard and after a few seconds silence, I just laughed. He laughed a nervous laugh too but his face told me he was actually watching my reaction. I realised maybe he was being serious but there was an awkward silence and I started blathering on about tacky vegas weddings and so he said "yeah they can be tacky can't they - but I don't know, I'd maybe go for it - if it was something I was going to do anyway and I was up that way - " another awkward silence and then a swift change of subject.
He was pretty quiet for the rest of the night and today have barely heard from him. My friend tells me he was OBVIOUSLY being serious but I'm shit scared of bringing it up with him again. Simply because - previously it has always been him that has backed off when he's thought things were moving too fast. He wanted to take things slow etc and I've tried so hard to give him the space and time he needed.
Now, he's coming here tonight to watch movies with me. I have to bring it up because if he was being serious, I need to apologise for laughing and we need to talk about it. What I'm frightened of is if I ask him if he was being serious and he bursts out laughing and says "what??? of course I was joking!!" and then thinks I'm a mad bunny boiler who wants to run off down the ailse with him.
But my friend said men don't joke about marriage and any man with half a brain cell knows not to bring up marriage with their girlfriend unless they mean it.
So honest opinions needed before tonight please. Yes I know I could just ask him and I intend to tonight but in the meantime - what do you reckon? and how should I ask him so that I don't sound crazy if he was joking.