3. A pizza slice, an omelette, a sleeping Big Bird? Rihanna’s vast Guo Pei spillage in 2015 might as well have been a gift for the internet’s Photoshop community, who spent the following week turning it into anything other than fashion. 4. If any guests couldn’t find a mobile phone signal in the ballroom last year, they should have tried standing next to Lupita Nyong’o. Or had she come as Marge Simpson? Nobody was sure. 5. Few guests (apart from Princess Leia maybe) are so practical as to incorporate rain cover into their gowns, which is probably why everybody made a fuss over Anne Hathaway’s practical Ralph Lauren number in 2015.