But Calaway, better known by his ring name "The Undertaker," has taken ... he's once again the subject of conversation as WWE commemorates his 30th anniversary with the company this month.

Keeping in character was pivotal to The Undertaker's success. However, he was known to crack a smile once in a while.

As Calaway marks his 30th anniversary as the menacing man in ... the duo can't be more different After 30 Years as 'The Undertaker,' WWE's Mark Calaway Ready for What's Next: 'It Went Really ...