You made a verbal contract/agreement prior to asking an important question. No need to consider the anus. Karma is the issue. Honestly, if I got excited about a listing I can easily see myself jumping into a deal and then asking an important question prior to payment. It would be a tough spot but I do my best to do what I feel is the right thing. If, after the verbal agreement you had asked about weight and had gotten the correct 11 pound answer I suppose you could have requested an honorable cancellation. That would have been fine, but the seller could have just as easily said that the deal was done and the bass was yours.
