laugh like a drain
v. phr.— «My dad was a huge Peter Sellers fan. If you’re in for two minutes, you’re in for two hours at my house. And it was always a nice truce. Because my dad was from Liverpool—he didn’t have a bad temper, but he was like a working-class guy—he just laughed like a drain all the way through it.» —“It’s a green party reunion for the cast of ‘Shrek the Third’” by Michael Ordoña Los Angeles Times May 6, 2007. (source: Double-Tongued Dictionary)