The well-known lemmings, in severe winters, at long intervals, move down from the mountains of Scandinavia in immense numbers, crossing lakes and rivers, eating their way through haystacks, and surmounting every obstacle till they reach the sea, whence very few return.
Source: wiktionary
Lemmings are strongly cohesive, but could be, in organisational terms, highly destructive for the business.
Source: wiktionary
Like a lemming, I followed the crowd, got to the right line and was concentrating hard when queried by the customs officer.
Source: wiktionary
“It’s like the one person did it once and since then everyone has followed like lemmings, they all just copy each other’s behaviour,” said [Paul] Loebenberg.
Source: wiktionary