haha, good question, actually it was pretty windy that day which is why I had to hold the sheet of paper down with a weight. I think they may have got blown in.
Its also possible they climbed in as there were a few more inside at one stage but a few were going nuts trying to get out and succeeded.
i, for one, know the sheer terror of having an acute phobia of being trapped in a giant ring of delicious honey, and on three seperate occasions, i almost found myself in that exact predicament.
lol............ actually............No.........I like em cos they keep my garbage bin clean.
However a totally random thought just crossed my mind as i envisaged an ant stuck in the centre desperately trying to eat his way out and finally succeeding but being unable to move because he was way to fat.