Thats how I know that

Tilting the glass against his lips, he took a mouthful of champagne, the taste bitter on his tongue as the bubbles tickled his nose. It wasn't really something he liked to taste but Derek insisted on spending a little money.There was a sound of glass breaking, a shocked laughter as Stiles grinned softly before the first scream had him jerking slightly, his head turning as he tried to find where the sound came.Blinking, Stiles could hear the commotion, his eyes seeking out the sight of their friends and family moving around quickly when his knees finally gave out and his body quickly dropped, hip hitting against the table causing pain to flare through his body before his body slumped on to the ground.Laughing himself, Stiles laid there for a moment, just blinking up towards the ceiling where small fairy-lights were tangled around the fabric, draping from the ceiling...a fixture of Lydia's doing, her words of, 'the ceiling is ugly Stiles, I'm not letting you have anything ugly at your wedding.' going through his mind as he shivered softly.He was getting cold, he shouldn’t of taken his suit jacket off.