Mine is a mega embarrassing mistake, one that I probably hear from my mates any time a radiator is mentioned,
Was fitting my front diffuser and wanted to mount it to bumper, subframe and radiator support. Started drilling the holes and all went well apart from the last hole I was drilling into the radiator support, didn't realise there was already a hole and I actually had the drill on the bottom of the radiator. Wondering why the hole was so easy to drill I pulled it back out and was smashed with a lot of fresh honda coolant!
Was a good excuse for a new alloy rad though!