Did something similar today myself.

Went to Fowlers to take a look at the sale.

Parked the bike up, kit off and went off for a wander round.

Didn't stay long as I wanted to go for a decent ride in the sun.

Got back to the bike and started rummaging in my pockets for my key couldn't find it anywhere starting to panic I check its not in my gloves or stuffed in my helmet....yep I'd only gone and left it in the ignition.

So glad no one nicked the bike, and did feel daft.

Must have been the effect of the sun!!