My laptop is playing up so I bought an external enclosure to back files up on to thinking I could use the 2.5" hard drive from my old laptop. Ordered enclosure, it came this morning. I go to take the hard drive out of the old laptop and realise that 'Past Louis' has beaten me to it and he went on to forget where he had put it.
To add insult to injury there are two 3.5" drives next to me and I could have got an enclosure for one of those instead.