Trainspotting star Ewan McGregor could not resist a joke on Twitter about his famous film as he watched BBC Four's Trainspotting Live.
The actor is currently filming Trainspotting 2, the sequel to the original 1996 movie which first made his name around the globe.
Ewan, who is reprising his role as heroin addict Mark Renton, tweeted on Wednesday that the people on his TV screen were not "on the skag" - a slang term for heroin.
Watching this Trainspotting Live show on BBC4 likesay but nun á these punters are on the skag likes What's goin oan?
-- Ewan McGregor (@mcgregor_ewan) July 13, 2016
Broadcast over three nights, Trainspotting Live captured the imagination of viewers as a team of enthusiasts and expert spotters reported live on a range of rail stock.
-- BBC (@BBC) July 13, 2016
The programme was helmed by Peter Snow, mathematician Dr Hannah Fry, presenter Tim Dunn and engineer Dick Strawbridge, along with a team of train enthusiasts.
It has won praise from viewers for its quirky subject and interesting content.
Viewers who had their say on Twitter couldn't help singling out Tim for extra praise. Brought up playing with model trains, his enthusiasm and knowledge proved a definite winner with fans.
Great show, BBC Four
-- Karthic Sinnadurai (@karthic180) July 13, 2016
#trainspottingLIVE - just what bbc4 is for - great series of programmes - an antidote to politics this week
-- StephanPStockton MBE (@Cardiffste) July 13, 2016
Well, that was the Beeb at its best. #trainspottingLIVE
-- Turnip Townshend (@Mr_Mulliner) July 13, 2016
Watching #trainspottingLIVE Only in Britain ? ??? a welcome break from the chaos our politicians have created
-- Janine (@janiw1815) July 13, 2016
That segment on the WTT (Working TimeTable) by Hannah Fry just then was excellent and very informative. #trainspottingLIVE
-- a43hst (@a43hst) July 13, 2016
I'm going to say this really quietly but I'm quite enjoying #trainspottingLIVE ?
-- Jaq (@Jacquie__) July 13, 2016
-- Rachel Orange (@RachelOrange1) July 13, 2016
-- Sarah Gerrard (@sazenrose) July 13, 2016
As dust settles on cab news I find myself watching #trainspottingLIVE. Love the celebration of our heritage. Great presenters. Esp Tim Dunn.
-- Louise Sampson (@LouiseSampson_) July 13, 2016
? Tim he is generally excited about trains. His little face..