This article presents two experiments that examine the validity of REBT's suggestion that contents do not influence the effect that rational and irrational beliefs (beliefs) have on the functionality of inferences (FI). Specifically, two role-playing experiments indicated that control and certainty contents that refer to rational and irrational beliefs influence the effect that those beliefs have on the FI. This finding was demonstrated when beliefs and their contents referred to either one's self or other people in a social context. Based upon the results of these two experiments, it may be prudent for REBT to modify its hypothesis that contents do not influence the effects that rational and irrational beliefs have on the FI. Specifically, it may wish to hypothesise that beliefs interact with contents to affect the FI.