Dumbell (and barbell)
Many years ago I deciding I was going to get fit and, not wanting to join a gym, I charged off to Argos, paid my money and waited for my purchase to arrive from the mysterious tardis-like back room. Eventually, two blokes staggered through carrying a large box. The assistant called out "Weights set?"
"That's me" I said.
"Hmm, have you got your car parked outside?"
"No" I said. What an odd question.
She looked me up and down and asked "Do you DO weights then?"
"No" I said and began to grasp where she was coming from.
"How on earth are you going to get these home?"
People in the queue began to laugh out loud. I had made a huge error. With help, I got one end of the box into the rucksack that I'd brought along for the task and trying hard to save a shred of dignity, lifted the entire thing a couple of inches off the ground, across the shop and into the street. I then left it in the middle of the pavement in the busy high street as I trudged off to find a phone box. My rationale being that if anyone was big enough to steal it, puny me would be unable to stop them anyway. After calling a cab I walked back to find it, unsurprisingly just where I'd left it.
Within a few months I'd joined a gym.
(Mr McKenzie Mr McKenzie, Wed 27 May 2009, 14:22, 4 replies)

I also did this
You don't realise how heavy 45kg is until you're a mile away from the nearest taxi-rank.

However I did manage to roll the box up the street (square box around barbell). Got a load of weird looks and chipped my weights.
( uberdeity Wondered why Owen Lars knew of the term "hell" on, Wed 27 May 2009, 14:57, closed)

Marvellous
Reminds me of a couple of Christmases ago, when I bought Mrs Sonic an ornamental stone mirror to go into the garden. Stone is bloody heavy stuff and it's lucky I live five minutes' walk from the garden centre (except in this case it was twenty minutes' walk...).
( Sonic the Hedgetrimmer doesn't care what you think, Wed 27 May 2009, 16:11, closed)

I did this too
And walked 2 miles home with them on my shoulder (alternating shoulders)! Took me about a week to recover, my shoulders looked like someone had whipped them raw.

I'm too tight to even contemplate leaving something I've just bought in the street.
(hangableautobulb is an anagram of the best album ever, on, Thu 28 May 2009, 12:01, closed)

Not the only one
Ah yes, I remember doing this - except that in my case I co-purchased the weights with a mate. Between us, we huffed and puffed until, sweaty, limbs trembling with effort and my vision starting to tunnel, we had made it about ten yards from the shop door into the street. My mate went to get the car and I was left, looking like a wimpy Beano character, to guard some cardboard boxes full of metal. Oddly, nobody snatched them and ran off with them and, like you, I reasoned that if anyone did, they'd probably be so out of their heads on steroids that I'd be a fool to stop them.
(Macnabbs may contain traces of exaggeration on, Thu 28 May 2009, 13:02, closed)