You have reminded me of the poorly-worded anti-terrorist ads on the tube.
Something along the lines of "If you see a suspicious package, don't ignore it, alert a member of staff or call the police." Presumably your remaining options are to steal it or panic.
(wellgroomedwookiee is a filthy-minded hobgoblin, Fri 26 Mar 2010, 14:27, 2 replies, latest was 16 years ago)

alternatively
do them all:

don't ignore - tell a staff member, then a cop.

then start panicing, and once everyone else is panicing as well, steal it.
(bamboozled Can hear you getting fatter, Fri 26 Mar 2010, 14:29, Reply)

One of the funniest things Andy Parsons ever came out with:
"Long gone are the days when you could see a bag or a parcel, just left, unattended on a bus or a train carriage and think...'I'm having that.'"
(LongJohnBaldry, Fri 26 Mar 2010, 14:29, Reply)

funniest only remotely amusing
( Monty Boyce, My cheese game is strong, Fri 26 Mar 2010, 14:36, Reply)

Shouldn't that be....
"Long. gone. are. the.. days. when. you. could. see. a. bag. or. a. parcel... just. left.. unattended.. on. a. bus. or.. a. train.. carriage.. and. think...'I'm.. having.. that.'"
( whenanimalsattackhumans clad in global hypercolour, Fri 26 Mar 2010, 14:59, Reply)

Hahahah
You mean

'Now.

Long. gone etc.'
( Monty Boyce, My cheese game is strong, Fri 26 Mar 2010, 15:03, Reply)