There was barely a hint of a smile when he scored the first goal, probably because he was still thinking about how many he could have scored if he'd been on the pitch for the previous 76 minutes.
Then with the next two strikes the grin grew broader, before Mohamed Salah was finally beaming as he clung onto Harvey Elliott during the long wait for the teenager's first ever Champions League goal to be confirmed by VAR.
Salah enjoyed himself in Glasgow, eventually, as he doubled his tally of open play goals for the season in just six minutes, taking the score from 3-1 to 6-1 and crushing a Rangers side who started with such promise but ended broken, battered and beaten by seven goals to one.