There are some posts here that are happy to use hackneyed old lines and jokes from the last century, and really that's why you need to put some thought into it.
The internet will throw up some decent ideas, but everyone’s looking at the same stuff, so try and be original.
Make notes on a card, bullet points, and stick to them. Don’t deviate.
The worst speeches I've heard are from those who deviated or had no plan and yet afterwards they really thought they’d made a good job of their speech. Little did they realise just what a dogs’ dinner they really made of it.
Stay sober. A drunk groom is a t^t.
Keep it short and stick to the salient facts. Your job is not to entertain, it’s to thank people, be humble and in awe of your beautiful bride. Then sit down. Don’t linger. And drop any reference to Bangor – it’ll go down like a led zeppelin (although, Zokes’s will giggle at the back).
There is no rule that says you can’t enjoy the speeches or that it needs to be some bear pit. You have, before you, your most loved and dearest, so be sincere and genuine, leave the p^ss taking to others, if you try and compete with the best man for the giggles or funniest lines you’ll come off worst as it’s simply not your remit to do the stand up funny man routine.
Good luck!