Hipster performs on the acoustic guitar.
The hipster is skateboarding.
The action of skateboarding can not typically be done while the hipster performs on the acoustic guitar.
exists e1 s1 x1 x2.(n_guitar(x2) & a_acoustic(s1) & Theme(s1,x2) & ne_nam_hipster(x1) & on(e1,x2) & Actor(e1,x1) & v_perform(e1))
exists e1 x1.(n_hipster(x1) & Actor(e1,x1) & v_skateboard(e1))