Ballons in Target stores? Absurd. TM's will be huffing that shit and chattering like a band of intoxicated mice in the back room. Might be fun though! Helium does some funky shit to the vocal cords.
I love how serious Target is about safety with an inert noble gas (8 feet of cleared steel in a low traffic area and nothing above it). At Walmart we just chained that shit up in a high traffic area next to the hazardous waste area.