Anecdotal evidence amongst people I've questioned falls into two main categories. The 1st is the failure to think the problem through formally. Many simply focus on the fact that whatever is in the box remains in the box. The 2nd is some variation of failure to accept the premise of an accurate prediction of their choice. This actually counter intuitive to most people and for others it is very hard to even casually contemplate a reality in which they can be perfectly predicted (and therefore, in their minds, have no 'free will / soul'). Many conversations simply devolve into 'Omega can't actually make a such an accurate prediction about my choice therefore or I'd normally 2 box so I'm not getting my million anyhow'.