There's something that bothers me when guys ask thier girlfriend to marry them in front of people.  It feels like a private moment to me.  What if she doesn't want to yet?  Sometimes I think that's why guys do it...they don't want to have to deal with the pressure of possible failure and feel better in front of a group.  They can show off thier "group dynamic" and the risk of a "no" feels further away.  In other words....WIMPS! 

This one's just silly.  Seriously...are you gonna invite everyone over when you conceive your first child too?  Maybe you could have them on standby with cameras ready to roll  just in case you feel some hesitation.