He Told Her She Was Lazy
Her boyfriend knew she was lazy, at least when it came to painting her toenails. So, he smirked when she sent him a photo of a pair of shoes to get his opinion on whether she should buy them.
He knew that she had only painted the first two toenails. Naturally, she denied it, but when he asked her to prove it, she took a photo of her foot without the shoes and confessed that he was right all along.