little blue can of lube from the bathroom. I assume you and your girlfriend used it this morning (during Saturday kitchen, btw we turned up the sound on tv to stop our ears burning) and forgot to take it back to your bedroom.
As you are so careless with your more 'personal' items I feel quite at liberty to also mention that you do need to make more of an 'effort' with your girlfriend, rather than rely too heavily on lube.
Thanks for that son.