There was a stellar line-up on Graham's couch last night.
Harry Styles, Vicky McClure and Rob Brydon all made an appearance on his show but it was the star of Mrs Brown's Boys who stole the show.
Before his rise to fame as Agnes Brown, Brendan O'Carroll worked as a waiter.
He told Graham, “I once almost killed Margaret Thatcher. It was a big lunch at Dublin Castle and I was working the top table.
“We were rushing to serve everyone before the event was on the 1pm news and, with just a few minutes to go, Mrs Thatcher asked for some fresh strawberries.
“I served her and she then asked for some caster sugar. I rushed to get it and with only seconds to spare, I poured some on the fruit.
“While the news was going out, I watched as she put a spoonful in her mouth and at that moment realised the bag I was holding was a bag of salt. Her face said it all! Only she and I knew about it and it was never mentioned.”
The Finglas native also told Graham about a passionate kiss he shared with singer James Blunt on his show All Round to Mrs Brown's.