RITALMAOACIDSs. I've just discovered if I laugh hard enough it turns into a Tim Curry-style "yuck yuck".
There's backend administration as well:
if(( !in_array($cart, $unreturned)
&& !in_array($cart, $stolen_by_joyriders)
&& !in_array($cart, $dumped_in_creek)
&& !in_array($cart, $acquired_by_competing_store)
&& !(in_array($cart, $abandoned_in_mall) && $staff->areLazy())
)||( in_array($cart, $acquired_from_competing_store)
|| in_array($cart, $found_in_residential_driveway)
))
$carts_available[] = $cart;