In the first part of the talk, we condition a Brownian motion on spending a total of at most $s > 0$ time units outside a bounded interval and discuss the behavior of the resulting process in the context of entropic repulsion. Moreover, we explicitly determine the exact asymptotic behavior of the probability that a Brownian motion on $[0,T]$ spends limited time outside a bounded interval, as $T \to \infty$. This is joint work with Frank Aurzada (Darmstadt) and Martin Kolb (Paderborn). In the second part, we condition a Brownian motion on having an atypically small $L_2$-norm on a long time interval and identify the resulting process as a well-known one. This is joint work with Frank Aurzada (Darmstadt) and Mikhail Lifshits (St. Petersburg).