Take a look at this screen capture of spots from DX Summit this evening.

Now take a closer look at this one spot.

What's wrong with this picture? First, most of us would consider it to be in very poor taste to post a spot bragging about a contact you made with another station. Take a look at the callsigns at the top of the Honor Roll. Do you see them posting spots about who they just worked? No, they let their record speak for itself. Second, this fellow brags about a QSO he made LAST NIGHT. 3C0C was not even on 40 meters when this person decided to post his spot AN ENTIRE DAY LATER. If anything, he should've chosen to brag about it LAST NIGHT when he actually made the contact.
But the biggest flaw in what he did was this - he managed to set everyone's spotting alarm off for 3C0C by posting a spot on a valid frequency. Some of us - probably a lot of us - have these alerts set up to go to logging programs, cell phones, pagers, Blackberrys or iPhones. So off we rush to check out 40 meters for 3C0C, only to discover that some bonehead posted a spot bragging about a QSO he made the night before.
Heck, let's say his intention wasn't to brag, but was to let everyone know to be on the lookout for 3C0C on 40 meters at such and such time...or if he was just hellbent on bragging, there's a way to do it. It's called making an announcement. OR, if he didn't know how to do that (or didn't want to take the time to learn), he could've posted his spot and used a frequency that's "out of bounds". He could've posted for 7.000 or 14.000 and bragged all he wanted. That way he wouldn't have made everyone's alarms go off.
Or look so foolish.