"Yeah, I know Becky and Stu said they were more than happy to have us stay at their place as long as we're in the area... but I just can't shake this feeling that we've overstayed our welcome..."
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Nothing says "make yourself at home" like a chain and padlock on the fridge, even if it's only made of yarn.
The website that offers this (free) crochet pattern describes it as a "whimsical padlock and chain to decorate your fridge". Because your fridge needs to be decorated, and magnets, calendars, and children's artwork just isn't enough decoration, darnit!