Every now and then the industry starts to wonder if it's lost its sense of humour. Has it all become too serious? Are we being just a bit too earnest? But then another D&AD Pencil-winning ad comes along and reminds us that, sometimes, appealing to the silly side is the best way to get your point across. So we've revisited the D&AD archive to find seven D&AD Pencil winners that should help raise a smile.