Aron Nimzowitsch wrote, "Even the laziest king flees wildly in the face of a double check.
[1] A famous example is Réti–Tartakower, Vienna 1910, which arose after: Réti sacrifices a queen in order to set up a double check, as well as an unstoppable checkmate in two moves.
In chess with variant rules or fairy pieces, other ways of delivering a double check may be possible.
After the en passant capture, five pieces discover-check the black king: both moas (the moa is a non-leaping knight which first takes a diagonal step, then an orthogonal one), the rook, the grasshopper (the grasshopper captures by leaping over an intervening piece) and the bishop.
After the en passant capture, three pieces discover-check the black king: the pawn, the knight-rider, and the rook.
Black would now be obliged to escape the multi-check by recapturing White's pawn with 2...Kxe6 or passively evading the checks without capturing by playing one of either 2...Ke7, 2...Ke8, 2...Kg6, 2...Kg7, or 2...Kg8.