Getting tapped with the honor of being a best man is one of the most exciting moments of any guy’s life. It’s the ultimate chance to be there for someone who has probably been there for you, more than you can properly thank them for, throughout the main events of your life. So if you’re preparing to take on your best man duties, and wondering what you should and shouldn’t do, take note of these 8 things you should 100% avoid doing on the wedding day.

1. Speak From the Heart

Even if you think it’s best to give an impromptu speech at the wedding, writing and rehearsing your toast beforehand is always the best way to go. When the nerves kick in and you have a couple of glasses of champagne already in your belly, you, and the groom, will feel more at ease if you have a pre-written speech.

2. Take Advantage of the Open Bar

Just because the free shots of Patron are eyeing you from the bar, doesn’t mean you have to take full advantage of them. As the Best Man, you’ll be setting an example that the other groomsmen will follow. So avoid the shots, until later in the night.

3. Change Out of the Tux

Even if you find yourself getting sweaty on the dance floor, leave your tux on for the night. Don’t take off your button down shirt or even change into a pair of shorts. Remember, you’re not at a Vegas pool party, you’re at an elegant affair.

4. Hit on the Bridesmaids

You’ll be spending a lot of time with the bridal party, so treat them with respect and don’t earn yourself the nickname of the creepy best man.

5. Get the Groom Drunk

It may be tempting to feed the groom a few drinks before the wedding to help calm his nerves and start the party early, but as the best man, one of your main jobs is to make sure the groom walks down the aisle. Keeping him as sober as possible pre-wedding will make your job a whole lot easier.

6. Suddenly Disappear

Be sure to have the groom’s back on his wedding day and try not to leave his side. Even if it seems like you have a lot of downtime before the wedding and you want to search for the nearest bar or spot to eat, make sure you don’t disappear on the groom.

7. Show Up Late

The last thing any groom wants to deal with on his wedding day is a Best Man that’s an hour late. Come as early as you can.

8. Take Control of the Dance Floor

It’s great to be the Best Man who is the life of the party, but try not to steal the show. Remember who the center of attention should be that night (hint: the bride and groom).