In 2010, Mann was cast as the protagonist in the comedy film Project X. Mann was told he could not audition for Project X because producers only wished to cast people without acting credits; Mann was ultimately given the role after auditioning seven times.
Tahun 2010, Mann mendapatkan peran antagonis dalam film komedi Project X. Mann berkata, dia tidak dapat mengikuti audisi Project X karena produser hanya menginginkan seseorang yang bersedia bermain tanpa pengalaman seni peran; Mann akhirnya diberikan peran itu setelah audisi selama tujuh kali.