Snail of a time

Three snails, Mick, Andy and Roy, decide to go on a picnic.
They pack a picnic basket with beer and sandwiches.
The trouble is the picnic site is a mile away so it takes them ten days to get there.
When they do, Mick unpacks the food and beer.
'Ok Roy give me the bottle opener',
'I didn't bring it' says Roy. 'I thought you packed it'.
Mick gets worried, he turns to Andy,' Did you bring the bottle opener'.
Naturally Andy didn't bring it.
So they're stuck a mile from anywhere without a bottle opener.
They both beg Roy to go back for it. But he refuses as he says they will eat all the
sandwiches when he's gone.
After two hours, and after they have sworn on their snail lives that
they will not eat the sandwiches, he finally agrees.
So Roy sets off down the road at a steady pace.
20 days pass and he still isn't back and
Mick and Andy are starving, but a promise is a promise.
Another 5 days and he still isn't back, but a promise is a promise.
Finally they can't take it any longer so they take out a sandwich each, and just
as they are about to eat it, Roy pops up from behind a rock and shouts
'I knew it'......I'm not F*#king going'