There must be no other explanation, especially considering they'd just been to church AND spoken about Jesus! What are the odds!? Miracles happen people....
If you look hard enough he seems to appear in many other house utensils and foods. What could this all mean? Is is God's latest form of communication with his 'perfect' creation, or merely the faithful seeing what they want to see in everyday items. The latter is undoubtedly the safer bet if you're a gambler.
Check this out! This young girl found irrefutable evidence of the Flying Spaghetti Monster in her dinner!
I was down at the local beach the other day and would you believe it? I found irrefutable evidence of the Invisible Pink Unicorn!
The human brain is a powerful organ that plays tricks on us all at times. It's programmed to see patterns in everything, as evolutionarily this was a great benefit to our ancestors. Daniel Dennett discusses this in length in his book "Breaking The Spell". I recommend this to anyone interested in having a further understanding of why we believe in the supernatural and what's lead to people seeing Jesus in their toast, among other things.