That coalition was the gun that fired the round into the Lib Dems foot.
I mean, I probably would have done the same thing - LD hadn't seen any real form of power for a hundred years or so, and getting a seat at the top table and having a Dep PM is a massively attractive option - but the compromises made has sealed it's fate for a generation of voters.
Shame, because they don't half put out some sensible manifesto pledges, but what's the point in proposing policies if the party is going to not just leave them unfulfilled, but actively tip it on it's head?
Welcome to politics, I suppose.

Certainly in the UK, the £1 preauth was just a check to see if the card was valid. Once the issuer returned the thumbs up, there was no cap on what you could draw from the pump.
Either a scenario like the above would happen, or people who were running on fumes two days before payday would do this stunt - full up with sixty quid's worth of fuel - and when it bounced, would go back in on payday and be like "hey that's weird, sounds like your machines are acting up" and nobody would be any the wiser.
Now it's a near universal £99 preauth at unstaffed pumps.