Just say no to drugs.

2009 December 1st, Wada, Keiichi; Tsukamoto, Yusuke; Kokubo, Eiichiro, “Planet Formation around Supermassive Black Holes in the Active Galactic Nuclei”, in The Astrophysical Journal, volume 886, number 2, article 107:

However, this may be said of external pressure only when it is applied to an arch that is dentitionally complete.

When the long, hot journey drew to its end and the train slowed down for the last time, there was a stir in Jessamy’s carriage. People began to shake crumbs from their laps and tidy themselves up a little.