After all, I was trying to read a newspaper, or compose a hilarious tweet about EastEnders, or dumbly gaze out of the window like a cow obliviously trundling towards an abattoir.
Like Channing Tatum, Efron has clocked that beefcake is best served with a side of irony: he's both gleefully repellent and improbably vulnerable as the dimwitted, near-sociopathic president of a party-hearty college fraternity who resolves to make life a living hell for the obliviously square thirtysomething couple (Seth Rogen and Rose Byrne) living next door.
I've even seen an ageing, ruddy-faced Darren Gough get into a row with a spectator at Guildford at the end of a Sunday match, the traffic roaring by obliviously just beyond the railings, Goughie being led away by team-mates having given his all with the ball, as usual.
Groups of young people there for the bands rather than the politics, they said chatted obliviously through an uninspiring speech by Mr Piñera, the presidential candidate of Chile's conservative opposition.Just three days later, on December 13th, Mr Piñera was jubilant.
LIKE all good cartoon characters, the world's biggest technology companies kept running obliviously in mid-air long after the economic ground fell away beneath them.
After a lengthy acting hiatus, he returned to the screen in American director Steven Spielberg's Jurassic Park (1993), playing the obliviously hubristic owner of a dinosaur theme park, a role he reprised in the 1997 sequel.
The daughter can hardly make her request for a lift to the station heard above the din of the Beatles chanting from "All You Need Is Love" as the parents once again dance to it obliviously.
It feels a little rushed and if he'd had 20 more minutes, he might have converted some of the youngsters in the crowd who couldn't help but look on at the 43-year-old obliviously.
What guests will find is a hostel created around "dozing off obliviously during your treasured pastime in the finest 'moment of sleep'".
"And that was to make a serial about Britain in 1912, when we were the most powerful nation on earth and we were also sailing towards the First World War as obliviously as the Titanic was sailing towards the iceberg".
Or, since it was the okra that I was totally focussed on after my survey of the market, did I bag it, pay for it, then notice the peaches on my way out, bag them as an afterthought, and then wander obliviously away, melting into the crowd, distracted by listening to my thriller, or by hatching a brand-new plan for dessert that evening?
