Went down to get my bike last night after work (got secured parking in underground car park for multi occupancy building) and some idiot had leant their bike on mine... what made it worse was that their pedal was resting on the spokes of my rear wheel!! 
It wasn't even a case of half their bike resting on mine and the other half resting on the metal bars that were present (2 horizontal bars, 1 at knee height, the other at waist height)... my bike was basically supporting theirs!! Both our bikes were chained to the bottom bar btw.
Made me livid... especially as I had just put a new wheel on (Mavic Open Sport on Tiagra Hub fwiw) only on it's second day of commuting.
Anyway, as I removed my bike, theirs fell onto the lower bar as my bike was no longer there to support it. Felt a bit guilty whilst I was cycling home as I could’ve picked it up and put it up against the top bar but was too mad at the time.
Now that the weather is a bit milder, all the fair weather cyclists are back as the racks were jam packed. Bliss over winter as only about half a dozen bikes are parked there but these last few days has been more like 20-30!!
Sorry, rant over.

It wasn't even a case of half their bike resting on mine and the other half resting on the metal bars that were present (2 horizontal bars, 1 at knee height, the other at waist height)... my bike was basically supporting theirs!! Both our bikes were chained to the bottom bar btw.
Made me livid... especially as I had just put a new wheel on (Mavic Open Sport on Tiagra Hub fwiw) only on it's second day of commuting.
Anyway, as I removed my bike, theirs fell onto the lower bar as my bike was no longer there to support it. Felt a bit guilty whilst I was cycling home as I could’ve picked it up and put it up against the top bar but was too mad at the time.
Now that the weather is a bit milder, all the fair weather cyclists are back as the racks were jam packed. Bliss over winter as only about half a dozen bikes are parked there but these last few days has been more like 20-30!!
Sorry, rant over.