For a sequence of non-negative measurable functions $f_n$, Fatou's lemma is a statement about the inequality
$$\int \liminf_{n\rightarrow \infty} f_n \mathrm{d}\mu \leq \liminf_{n\rightarrow \infty}(\int f_n \mathrm{d} \mu)$$
or alternatively (for sequences of real functions dominated by some integrable function)
$$\limsup_{n\rightarrow \infty}(\int f_n \mathrm{d} \mu) \leq \int \limsup_{n\rightarrow \infty} f_n \mathrm{d}\mu$$
I keep forgetting the direction of these two inequalities. I know that using the concepts repeatedly is the best way to remember them.
But I am interested about learning intuitive tricks that people use to quickly remember them.
(For instance, to remember the direction of Jensen's inequality, I just picture a convex function and a line intersecting it.)