Different capabilites at different places

[bolt101]

When at the gym i lift my normal weight at normal reps with normal rest
for me.
However when i am at my home gym by myself i can 'gee' myself up (pump myself up/get enthusiastic about weights) and lift double the normal amount.

Does anybody else feel this?
Is there supplements that can give yu extrodinary boosts to adrenilin or
something like this?

[NewlyDesigned]

Double? Think yer exaggerating a bit?
I found I lift a slight amount (maybe 10 pounds) more at the gym then at home cause people are watching.